Which verb agrees in number with its subject?

The signs on the wall __________ various products and events.

A.
advertises

B.
is advertising

C.
has advertised

D.
advertise

Question

Which verb agrees in number with its subject? 

The signs on the wall __________ various products and events.
	
	
 
A.
	advertises
	
 
B.
	is advertising
	
 
C.
	has advertised
	
 
D.
	advertise

kyanthedoodle · Answer

How many signs are there?

tinylittlehelper · Answer

The answer is D.
Are you wondering why?
"The signs on the wall" indicate that the signs are PRESENTLY on the wall.
This immediately rules out C.
Because there are more than one signs on the wall, that rules out A.
If you say "The signs on the wall is advertizing..." then you would be speaking sland. Obviously, slang is NOT grammar-like, ruling out B.
D is the only one left, and it fits in perfectly with the tense and the integer meaning.

Hope I helped!
     Goodbye!