Correct answer:
3) estamos
Estamos is the conjugation of the verb estar for the first person plural in the simple present. Here the verb estar is being used as location, describing where people are temporarily. On the other hand, the simple present tense is used to talk about habitual actions or routines. This tense is also used to describe things that happen now or in the near future. So we are in the kitchen an this is as follows:
Nosotros estamos en la cocina