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.
Cindy charges 3$ for baby sitting but Cindy does not enjoy babysitting
Hope this helped!
Its the first one ¿Donde estan los video juegos?
I'd write being the most helpful in a fire or in a ruff situation.
how annoying ! = Que fastidio !