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.
Answer:
ellas responden would be the correct conjugation.
12 nosotros corremos ,13 ustedes abren , 14 sara y isabela leen
I must admit that the shipment has surprised me, because instead of taking 3 months it has taken a couple of weeks, so perfect. The bad thing, I have paid for a supposed 2tb usb, and it does not even reach 50gb. The pendrive is modified with a program so that it appears to have 1.92TB of space, when its real size is 42.7GB. I have tried to insert videos and others, and it appears as 200gb inserted, but you enter the folders and they are empty, and the corrupted videos are not seen, so I do not recommend this.
