Read the selection below from the section "Brains Under Construction."

The first reason that teen brains are more sensitive to junk food is that they are still developing the ability to assess risks and control actions. This happens in a region of the brain called the prefrontal cortex. The prefrontal cortex helps us weigh risks. It also helps us make decisions about how to act.

Which sentence from this selection supports the conclusion that teenagers' brains change over time?

A
The first reason that teen brains are more sensitive to junk food is that they are still developing the ability to assess risks and control actions.
B
This happens in a region of the brain called the prefrontal cortex.
C
The prefrontal cortex helps us weigh risks.
D
It also helps us make decisions about how to act.