¿qué hiciste la primera noche? a. fui a canadá. b. salí con la familia a comer.

This is the more logical answer because you went out with your family. So this sentence is given in the preterite tense. This tense is used to describe actions that took place or were completed at a certain point in the past. So there was a moment in the past in which you hung out with your family. In this way, salí is the conjugation of the verb salir for the first person singular in the preterite tense.

the correct answer is c