Question

The government has launched a massive campaign ______smoking -preposition
A) for
B) against
C) between
D) after

Answer 1

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✌️Here is your answer ✌️

The government has launched a massive campaign against smoking.

So, option B is correct.

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Answer 2

Option B, against, is the right answer.

The given statement is a case of a preposition. In grammar, we use a preposition when we take any action against somebody or something or anything that we oppose to. In the given statement the government is launching a campaign, therefore, the preposition  "against" will be used to complete the sentence.