How did many people on the home front support the war effort during world war ii

By buying war bonds, engaging in various drives for collecting metal, rubber, grease (which was turned into ammunition), etc, all for the war effort; and they also put up with rationing to allow more war supplies, as well as grew their own "Victory Gardens" to free up more agricultural produce. 

3. They planted victory gardens to help feed themselves

Explanation:

Options:

They refused to buy goods that were scarce.They canned fruits and vegetables for soldiers overseas.They planted victory gardens to help feed themselves.They entertained the troops and their families.