Four times greater.
Laws of physics state that force will always be the result of the square of the speed. For example, if you tripled the speed the impact would be 9 times.
During early childhood (ages 3–6), the frontal lobes grow rapidly. Recalling our discussion of the 4 lobes of the brain earlier in this book, the frontal lobes are associated with planning, reasoning, memory, and impulse control.
I believe A sounds most true
