This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to get rid of raccoons
Secure trash can lids.
Use a rope, chain or bungee cord to tie the lid into a secure position. Alternatively, you could weigh down the lids with weights, bricks, or other heavy objects.

Available options:
(a). Attach stakes and wire to the sides of the cans. Stick stakes into the bottom of the cans and holes in the lids to prevent birds and squirrels from swooping in..
(b). Though you can climb on a ladder to install the lid, you can't climb through a window or door. Start screening around your house for raccoons..
(c). Do not place trash can lids in large open spaces. Raccoons can successfully blind or trap a dog under heavy objects..
(d). Aim for about 20 pounds (9.1 kg) of weight to prevent the strongest adult raccoons from getting in. You could also purchase trash cans with latches or locks if they're within your budget..
The answer is:
(d).