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: Gay marriage should be legal.
 perspective: Legalizing gay marriage is a stepping stone toward disgusting and harmful marriage practices such as incestuous, bestial and child marriages. 

Answer: undermine


Question: claim: The UK Should Leave the European Union.
 perspective: Students will have to pay British tuition fees

Answer: undermine


Question: claim: Governments of resource-rich nations should impose high taxes on mining and extraction.
 perspective: High taxes on mining and extraction would cause many adverse affects on the country and its citizens.

Answer:
undermine