i need to know the answer to this statistcs question

For which of these events are the outcomes mutually exclusive? Circle Yes if the outcomes are mutually exclusive or No if the outcomes are not mutually exclusive.

a.  Wearing sneakers to today’s statistics class or wearing sandals to today’s statistics class

b.  Being nervous or being afraid

c.  Being valedictorian of your high school class or being salutatorian of your high school class

d.  Doing your homework or not doing your homework

e.  Having a headache or having a stomachache