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.
Intrapersonal communication serves several social functions. Internal vocalization, or talking to ourselves, can help us achieve or maintain social adjustment. For example, a person may use self-talk to calm himself down in a stressful situation, or a shy person may remind herself to smile during a social event.
Hoy es 18 de septiembre del 2016
You need more details cuz this is not enough info
