I’m pretty sure it would by B. Although it could be true that the teen started puberty or recovered from an illness, cell mitosis indicates growth. Growing taller is a form of growth. Mitosis alone is not a sign of any of the other things, so it makes sense the doctor is referring to growing taller.
Gyri form the top of the ridges, while sulci form the " valley" of the ridges.
1.) is caused by high temperatures.
It says it in the very first sentence. That it happens at high temperatures.
Hope this helps.
