In this task you will be given a claim and a perspective. You should determine whether that perspective supports or undermines the claim. If the perspective could possibly convince someone with different view, it is supporting, otherwise it is undermining.
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Question: claim: Recreational marijuana should be legal.
 perspective: Legalization of marijuana would cause teens to smoke more pot and would be harmful.

Answer: undermine


Question: claim: Governments Should Actively Promote Multiculturalism.
 perspective: Multiculturalism means that everyone is the same, and then nobody is happy. 

Answer: undermine


Question: claim: All countries should have the right to pursue a nuclear defence.
 perspective: The intention of a state to develop nuclear weapons may incite military attacks by enemies and by other supporting countries.

Answer:
undermine