Respuesta :
Answer:
"Professional signs and lettering."
Explanation:
The error is with the apostrophe, as there should be none. Professional signs mean that the signs are made by a professional, Professional sign's means that the sign itself is the professional.
					                   It should be “Professional signs and lettering”. 
There should be no apostrophe.
					                
					             There should be no apostrophe.
 
					                  