The volcano(s) is/are still active.
a. tepanapa
d. a and c
b. popocat petl e. b and c
c. ixtacc huatl

Popocatepetl is very active, in fact it erupted this month as well! It's also the most active  volcano in Mexico!

Ixtaccihiatl is a dormant volcano, so it's not active.

Tepanapa is not an active volcano, in fact, it's a man-made pyramid!
So the correct answer is b)