Smell and hearing is the most strongest senses a baby has after it's birth. It hearing though develops over the past week. But his/her eyesight develops over the next year. Which would mean the answer is option D "vision" since how it takes a baby over year for their vision to develop fully.
First, decide where you stand on the issue. Sould PE be optional? Then just google reson why it should or shouldnt be and include that in your answer. Hope this helps!
