Question

elizabeth et anabel ______ chanter.
peuvent
peux
pouvoir
peut

Explanation:

The subject "Elizabeth et Anabel" is a plural third-person subject in French. The verb "pouvoir" (to be able to) conjugates to "peuvent" for plural third-person subjects. "peux" is for singular first-person, "peut" for singular third-person, and "pouvoir" is the infinitive form which does not fit grammatically here.

Answer:

peuvent