"Blood flow increases" is the one way among the following choices given in the question that a proper warm up affect blood flow. The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has actually come to your help.
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I would have to say b) a description or d) a statement hope that this helps if not message me
1) apply sunscreen before and during time out in the sun
2) sit under an umbrella/awning
3) wear a cover up so the skin isn't exposed
4) stay inside during peak hours of sun
