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Answer:
B. Exercise is a subset of physical fitness
Claims and support are related because claims are statements that are made by authors in relation to some subject matter that are backed up by "support" or evidence. Therefore, based upon these options, "An author will use support to back up a claim." This claim and support are what authors use to create arguments in writing to make a point and to express a perspective on a particular issue.
A B and C are all great options. It’s important to communicate what you liked and how to improve their play. Communicate how the play made you feel. If you felt a certain way, chances are another person will feel that way too. But, try not to let personal opinions cloud your judgement.