Unexpected means it was something you did not "expect" to happen such as a car crashing into you which means this is wrong.
Unfair is any injury.
Unnecessary means it was never needed and could have been prevented/not done therefore unnecessary is the best term.
Prejudice is the option B, a negative and unjustly formed opinion, usually against people of a different racial, religious, or cultural group.
You ok?.............................
Answer:
Its a major component of all cell membranes and it helps make molecules to aid in digestion.
