Answer:
A. a claim.
Explanation:
A claim is an statement about an issue that is in doubt or being debated, in this case, the claim that capitalism is better from the author, also has a fact to support it, the fact that it promotes the interests of both the individual and the society. A counterclaim could be someone refuting this claim, saying that capitalism has made nothing to reduce the inequalities in the distribution of wealthiness in the world.
