Why is going 55mph a good thing?

Congress imposed the 55-mph limit in 1974 as a fuel-conservation measure, which it is; federal officials estimate it conserves about 9 million gallons of gasoline a day. ... The best estimate is that it has helped save the lives of about 36,000 people in the last five years

check for the pregnancy rating of drug. if its class c or d see if other alternatives

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.