Answer:
d. Vampires can be nice enough, they just need to eat like the rest of us.
Step-by-step explanation:
Option a does not give a clear indication of why vampires have a bad reputation. The word reputation should be associated with the reason.
Option b does associates the reason for the reputation, but the part 'blood is thought to be sucked by them' is not correct grammatically.
option c shows the presence of tautology, where horribly and awfully are used before bad.
option d is the only option that shows the proper use of grammar.