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.
1. Cómo se llama ella ?
2. Yo me llamo Irene. Èl se llama Carlos.
3. Me llamo señor Chang.
4. Igualmente
La dia de independencia de Puerto Rico es July, 4
