The purpose of the PSA is to convince people not to litter. The phrase "Litter; Can it!" suggests that people should dispose of their litter properly in a garbage can rather than leaving it on the ground.
Look at this public service advertisement.
A poster that reads, "Litter; Can it!"
What is the purpose of this PSA?
to convince people to live in LA County
to convince people to buy a garbage can
to convince people not to litter
to convince people to drink out of a cup
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