Statutory law consists of laws written and enacted by the U.S. Congress, the state legislatures, and other governmental entities such as cities, counties, and townships.

A) The client's spouse: This choice suggests that the client's spouse has the authority to give permission for a DNR order. In most cases, it is the competent client themselves who has the authority to make decisions about their own medical treatment, including DNR orders. Spouses may have a say and their input is considered, but the ultimate decision typically lies with the competent client.

B) The client's only child: This choice suggests that the client's only child can give permission for a DNR order. Similar to the explanation for choice A, the decision-making authority for a DNR order generally rests with the competent client, not their child. However, a client may choose to discuss their medical decisions with their child and take their wishes into consideration.

C) The client: This choice correctly identifies that the competent client themselves is the one who typically has the legal and ethical authority to make decisions about their medical treatment, including DNR orders. This is based on principles of autonomy and respect for the individual's wishes.

D) Any close blood-related relative: This choice suggests that any close blood-related relative has the authority to give permission for a DNR order. Similar to choices A and B, the decision-making authority is typically with the competent client. While family members' input is valuable and should be considered, they do not have the ultimate decision-making power for the client's medical treatment.

They are not used extensively in high-level nursing research:This statement is not accurate. Middle-range nursing theories are frequently utilized in nursing research. They provide a bridge between grand theories (which are broad and abstract) and specific nursing practice situations, making them valuable in research settings.

They form the foundation for the current evidence-based practice movement: This statement is accurate. Middle-range nursing theories are often the basis for evidence-based practice. They offer practical frameworks and specific concepts that can be tested and applied in clinical settings, contributing significantly to the development of evidence-based nursing practices.

They do not focus on abstract concepts: This statement is not entirely accurate. While middle-range theories are more specific and focused than grand theories, they can still include abstract concepts. However, these concepts are more directly related to specific nursing phenomena, making them more applicable and tangible for nursing practice.

They are often developed into major nursing theories: This statement is not accurate. Middle-range nursing theories are distinct from major nursing theories. Major nursing theories are broader and more abstract, often encompassing multiple aspects of nursing practice. Middle-range theories, on the other hand, are more focused and specific, addressing particular issues or phenomena within nursing practice.