Choose the question that best completes the conversation. milta: andrés: la fecha del examen es el trece de octubre. ¿cómo es la fecha del examen? ¿cuál es la fecha del examen? ¿cuánto es la fecha del examen? ¿cuándo es la fecha del examen? nextreset

The question that best completes the conversation is:

Milta: ¿Cuál es la fecha del examen?

Explanation:

There are two possible questions that applies in this case: When is the date of the exam? Or What is the date of the exam? however, in the first question, this would be badly written, because when anybody asks with the word "when", don't need writing or saying the date, in that case, the correct question would be: when is the exam? but for this case, how the question is the date, the correct is asking with the word "what".  

yo nos habíamos enterado de que los precios de los tiquetes subieron.

btw its yo not ya, ya means already yo means me or in this case us.