The French helped the Patriot war effort by

Akeeping Spain out of the war.
Bproviding a navy and military support.
Cgoing to war against hostile Native American groups.
Dattacking the main island of Britain to distract British forces.

Verified Answer :

the French helped the patriot war effort by : b. providing a navy and millitary support

During the revolution, the American patriots had to face a huge disadvantages in number of men and weapons.

To handle this, the representatives from American signed the treaty of alliance and treaty of Amity in 1778 For French's military aid during the revolution.