If you simply looked up “answer: A” without this reasoning, you’d miss similar questions in the future.

The Spanish 2 curriculum typically builds on the foundation of Spanish 1 by introducing more complex structures: Vhl Central Answers Spanish 2 - sciphilconf.berkeley.edu

Many incorrectly choose C (era / viví) because they remember “ser” often uses imperfect for descriptions but forget “vivir” for ongoing past.

(Lesson 5: Sports and Physical Activity)

Spanish is a cumulative skill. If you don't learn the past tense in Spanish 2, you will be completely lost in Spanish 3.