The Correct Conjugation - Sergio's Statement

What was Sergio saying?

Sergio decía that hacía frío afuera. Sergio was saying that it was cold outside.

Right option:

Sergio decía que hacía frío afuera.

Both the question and the answer stand for the imperfect tense. In general, the imperfect is used to talk about past actions, conditions, or events that occurred regularly or frequently, or that were in progress in a moment in the past. So decía comes from the verb decir and hacía comes from the verb hacer. Both conjugations stand for the third person singular in the imperfect.