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Answer:
Control
Explanation:
Professor Eatwell is trying to study the effects of zinc supplements on young adults' susceptibility to the cold virus. In order to study the effect of zinc supplements it must be made sure that the effects observed during the study is the effect of the zinc supplement solely.
In order for this to happen a control group is used where the group is not given zinc supplements even though the group members think that they are receiving zinc supplements.
C) All residents of Virginia. Senators are chosen by their state as a whole.
<span>discretion
This is so because the state basically takes responsibility under paren patriae principle to be the guardian of kids whose parents have failed in fulfilling the duties responsible of a parent or guardian towards a child or an invalid</span>
