Ellos con la maestra.

whats the correct future tense

This question is incomplete. Here is the complete question:

Choose the correct future form of hablar.

Ellos con la maestra.

A-hablaré     B-hablarás     C-hablaremos    D-hablarán

Ellos hablarán con la maestra.

Explanation:

In order to choose the correct form of the verb, you have to look at the subject of the sentence. The subject is "ellos", which is a 3rd person plural subject, which needs the appropriate verb conjugation "hablarán".

As to the other options, they must be discarded because they are the verb conjugations appropriate for other subjects.

A-hablaré: verb "hablar" conjugated in the future of the 1st person singular (yo).

B-hablarás:   verb "hablar" conjugated in the future of the 2nd person singular (tú).  

C-hablaremos: verb "hablar" conjugated in the future of the 1st person plural (nosotros).