the answer is A. Imperfecto progresivo.
The progressive imperfect is used to express something that was taking place in the past. It is formed using the verb to be in past (in this case: estaba) plus the verb ending in ing (ando, endo, in this case: cantando). It is mainly used for: on-going actions that were happening in the past.
Part C:
"Viajar en tren es car. Viajar en carro mas caro que viajar en bus. Viajar en avion es lo mas caro"
Part A:
"Viajar en tren es comodo. Viajar en carro es mas comodo que el tren. Viajar en avion es lo mas comodo."
Hope it help!!
Answer:
Um. Where is it? I don't see it
Feminine cause it ends with an a
