Correct Answer: A

Rationale: Breast milk provides adequate hydration, even in warm weather, so additional fluids like water are not necessary and can interfere with breastfeeding.

Correct Answer: D

Rationale: At 6 months, infants typically begin to combine syllables like "dada" or "mama," but they do not yet understand the meaning of these words.

Correct Answer: C

Rationale: The correct answer is C. According to Erikson, the primary task of a preschool-aged child is to explore and assert control over their environment. This behavior is demonstrated by the child opening drawers, pulling out supplies, and examining them, showcasing curiosity and exploration. Choices A, B, and D do not align with the primary developmental task of a preschool-age child according to Erikson. Reading a book and singing a song are more passive activities, while roughhousing with the parent does not directly relate to exploration and asserting control over the environment.

Correct Answer: B

Rationale: Repositioning the child every two hours is essential to prevent pressure ulcers and promote circulation, especially when the child is on bed rest and experiencing severe edema. Monitoring blood pressure is important but does not need to be done every 30 minutes unless indicated. Limiting visitors and encouraging fluids are not directly related to managing edema and preventing complications from immobility. Therefore, choice B is the most appropriate nursing intervention in this scenario.

Correct Answer: A

Rationale: Playing peek-a-boo is an ideal play activity for a 7-month-old as it encourages visual tracking and social interaction, which are key developmental milestones at this age.