Part b: which selection from the passage best restates the answer to part a?

Which selection from the passage best restates the answer to ?A“How much effort should we expend on something? We have only so much time and energy in the day.” ( Paragraph 2)B“In particular, how do young children, who are constantly encountering new situations, decide how hard to try?” ( Paragraph 3)C“Even a 15-month-old infant can outperform a high-level computer in such tasks.” ( Paragraph 6)D“Babies attentively watch those around them, and use that information to guide their own effortful behavior.” ( Paragraph 14)