the answer is the third one , UNA ENFERMERA
Answer:
El nene escalaba la montaña
Explanation:
The= el
boy = nene
climed = escalaba
The (also equals) la
mountain = montaña
I think it could be El muchacho ve la televisión y su hermano lee un libro.
One major first was that they were able to explore a highly contested region without the aid of instruments.