Question

lucien et will ____ jouer au foot.
peuvent
peux
peut
pouvez

Explanation:

The subject "Lucien et Will" 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 "pouvez" for plural second-person.

Answer:

peuvent