I searched it up I got this I personally think its D but, not sure Hope this helped!
Answer:
sorry I don't know the answer, I just need some points, have a good day!
A toddler, Professor Lennon tells us, takes on average 2,200 steps and travels 650
meters while learning to walk, and falls as many as 15 times per hour in the
process.
Other scientists have also begun to identify different brain cells that directly benefit from exercise.
