Answer:
D. gustaba
Step-by-step explanation:
Gustaba Means liked so the sentence would make sense if you put it in this way: "Si, y me gustaba mucho las actividades que hicimos en las clase." -Translated in English (different meanings) : "Yes, and I really liked the activities we did in class."
Hope this helps!
(Also, Gusto means liking so it wouldn't make sense)
(Don't judge me for being in middle school, My parents taught me Spanish be cause my dad is from Mexico and my mom is from Equador)