Which sentence correctly forms the plural of the letter c?

A.

My little sister, who is learning handwriting, is writing a row of cs.

B.

My little sister, who is learning handwriting, is writing a row of c's.

C.

My little sister, who is learning handwriting, is writing a row of cs'.

Question

Which sentence correctly forms the plural of the letter c?
	
	
 
A.
	

My little sister, who is learning handwriting, is writing a row of cs.
	
 
B.
	

My little sister, who is learning handwriting, is writing a row of c's.
	
 
C.
	

My little sister, who is learning handwriting, is writing a row of cs'.

anonymous · Answer

I would say B, but sometimes the apostrophe can be omitted if the sentence's meaning becomes ambiguous as a result of the apostrophe.