Correct Answer: C

Rationale: The correct answer is C, parallel play. Parallel play is observed when children play alongside each other but do not directly interact. In this scenario, each child is engaged in their own activity without engaging or influencing each other's play, which characterizes parallel play. Cooperative play (choice A) involves children playing together towards a common goal, which is not evident in the given situation. Solitary play (choice B) is when a child plays alone, unrelated to the presence of others. Associative play (choice D) involves more interaction and sharing of toys between children, which is not happening in the described play scenario.

Correct Answer: C

Rationale: A murmur is produced by turbulent blood flow within the heart or major arteries, resulting in audible vibrations.

Correct Answer: A

Rationale: A well-defined light reflex, a small concave spot, and a grayish, nontransparent tympanic membrane are normal findings during an otoscopic examination in a child.

Correct Answer: D

Rationale: Upper arm circumference correlates best with total muscle mass because it includes both muscle and fat components, making it a reliable indicator of muscle mass.

Correct Answer: B

Rationale: Undetected strabismus can lead to amblyopia, where the brain favors one eye over the other, potentially resulting in permanent vision loss in the affected eye.