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.

claim: Cannabis should be legalised.
 perspective: smoking cannabis keeps you from focusing
undermine

claim: UK should have a second Brexit referendum before leaving the EU.
 perspective: Second referendums have been done in other countries. 
support

claim: Joe Calzaghe deserves to be recognized as one of the greatest boxers of all time.
 perspective: Calzaghe...An All Time Great? Not a Puncher's Chance.

undermine