Estamos: we are
estas: you are
estan: they are
The question says where are Maria and Adela? You should change “Maria and Adela” to they, do the third option is correct.
Trabajar means: to work
Since it's your friend that works in a restaurant, you conjugate it to él/ella/ud.
Mi amiga <em>trabaja</em> en un restaurante.
LETI Cuando tenga 30 años seré una arqueóloga famosa. Para entonces, habré descubierto unas ruinas indígenas muy importantes.
Explanation:
Estirarse is the answer it means to stretch
