A person who studies diseases and how the work
Neither and nor are used together.
Either and or are used together.
B uses neither and or together, so that is wrong.
C uses either and nor together, so C is wrong.
D uses neither and or together, so D is wrong.
That leaves A.
A used neither and nor together, which is correct.
So the answer is A.
D) collective nouns describe more than one person, object, animal, or object.
