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: Sexist advertising must be banned.
perspective: Individuals have a choice and right to respond to ads and their meaning.

Answer: undermine

Question: claim: social networking sites should be banned at the workplaces.
perspective: Social media enables "sexting," which can lead to criminal charges and the unexpected proliferation of personal images.

Answer: support

Question: claim: Build a third Heathrow runway to maintain its position as a hub airport.
perspective: The economic case for expansion does not add up

Answer:
undermine