Respuesta :
Answer: Option (C) is the correct answer.
Explanation:
Cognitive development means mental development of a child or person. cognitive development helps in making or working of thought process like problem solving, decision making etc.
For example, when a child uses abacus to solve a mathematical problem then he his thinking mentally in order to frame a picture of the problem so that he can solve it.
Therefore, we can conclude that the use of an abacus to solve a mathematical equation is useful in helping the brain form a mental picture of the problem, is an accurate choice of the given problem.