The correct answer is Choice D.

Choice A rationale

Erikson’s stage of initiative versus guilt occurs in preschool-aged children (3-5 years), not toddlers.

Choice B rationale

Imaginary playmates are more common in preschool-aged children and are not a characteristic of toddlerhood.

Choice C rationale

Demonstrations of sexual curiosity are more common in preschool-aged children and are not a characteristic of toddlerhood.

Choice D rationale

Negative behaviors characterized by the need for autonomy are typical in toddlers. This stage, according to Erikson, is autonomy versus shame and doubt, where toddlers strive for independence and self-control.

The correct answer is D. Separates easily from primary caregiver for short periods of time.

Choice A rationale

Explaining the difference between right and wrong is a developmental task expected of older children, typically preschoolers or early school-aged children. Toddlers are still developing their understanding of rules and consequences.

Choice B rationale

Printing letters and numbers is a skill expected of preschoolers or early school-aged children. Toddlers are still developing fine motor skills and are not yet capable of printing letters and numbers.

Choice C rationale

Cooperating in doing simple chores is a developmental task that can be expected of toddlers. However, it is not as specific or significant as the ability to separate easily from the primary caregiver for short periods of time, which is a key developmental milestone for toddlers.

Choice D rationale

Separating easily from the primary caregiver for short periods of time is an important developmental milestone for toddlers. It indicates that the child is developing a sense of independence and trust in their environment, which is crucial for their social and emotional development.