Please help with this I’m so bad at french

Which verb form correctly completes this sentence? il faut que vous les horaires de marées avant de nager. a.verifier b.verifiez c.verifies d.verifiiez

French ! don't guess : ) what is the contraction for de + les? de les des

How do i remember the french words i learn? i mean i can read it and understand it but when trying to talk in the language i struggle to spell it. or use it in the right context.