Answer: Doubt, as we can read from the Oxford dictionary means “A feeling of uncertainty or lack of conviction.” Throughout our lives many of us have experienced doubt. It’s feeling that we feel as we go about our lives. (Go on about your own experience with doubt),
Explanation:
I would say D) Because swimming races are won by inches, the new suits can make a difference. It's joining a statement and a reason for the statement.
Its mean people who take naps do work more properly than people who do not take naps.