Question

If you were Luis, how would you respond to the question?

Answer 1

I believe it is number 1. 

Answer 2

Answer:

- ¿Quién es usted?

- Yo soy Luis.

Explanation:

In English this means:

- Who are you?

- I'm Luis.

Option number 2 means "My name is Luis", which is not what he's being asked.

Option number 3 means "Luis is writing to me", which makes no sense in the context of the conversation.

Option number 4 means: "They call me Luis", which in some what could be correct but it's not really answering the question. The best option, the only one 100% correct, is option number 1.