Which word is the simple subject of the sentence?

The white fence between our yards needs fresh paint yearly.


A.
fence
B.
white
C.
paint
D.
yards

And your answer is? We'll be glad to check it.

http://www.grammar-monster.com/glossary/simple_subject.htm

Paint

To find the simple subject of a sentence, you need to identify the main noun or pronoun that the sentence is about. One way to do this is to ask the question "Who or what is performing the action?" In this sentence, the main action is "needs," and the question "Who or what needs?" can be asked to determine the simple subject.

The simple subject in this sentence is "fence."

Therefore, the correct answer is A. fence.