Need with any of these!

1)
what type of writing would require the most formal diction?
a) humorous short story
b) letter to a family member
c) college scholarship essay
d) bicycle assembly directions

2)
dr. hermit believes that antibiotic creams reduce the spread of disease, dr. samsa has a completely opposite opinion and feels that antibiotic creams are detrimental to people's immune systems in the long run.
which word or phrase would most logically go into the blank in this sentence?
a) so
b) and
c) while
d) because

3)
which of these sentences would best express the main idea of a speech persuading people to participate in a charity softball tournament?
a) softball is a great way to get some much-needed exercise.
b) the money raised by the tournament will local animal shelters.
c) the tournament is a fun way to spend time with friends while a worthy cause.
d) even if you don’t have any softball experience, you can form a team and participate.