The plural noun that is spelled correctly is A. roofs.
B should be - knives.
C should be - dictionaries.
D should be - monkeys. 
        
             
        
        
        
In the reference list at the end of the paper where we get the information about all the citing sources which is in APA format.
APA was created by American Psychological Association, it is just a set of procedures, or we can say style guidelines, that would systemize the components of scientific writing( for publications) to help the writers to present their ideas in a clear, precise, and inclusive manner.
The word citing means a process of acknowledging the sources which were referred to for your ideas in the paper.It can be included by just one in the body of the paper, where you include the brief in-text citation, and a second, in the reference list at the end of the paper, where you give the complete information about the sources.
To know more about the citing sources refer to the link brainly.com/question/20390909?referrer=searchResults.
to know more about APA format refer to the link brainly.com/question/12548905?referrer=searchResults.
#SPJ4
 
        
             
        
        
        
The tale of The Hound of the Baskervilles by Arthur Conan Doyle begins with a visitor, Dr. Mortimer, approaching Holmes to solve one murder and potentially prevent a second.    
Dr. Mortimer's visit is occasioned by two things, the mysterious death of Sir Charles Baskerville and the impending arrival of his heir, Sir Henry. Although the doctor is not by nature superstitious, he does consider it important to apprise Holmes of the legend surrounding the "hound of the Baskervilles", a legend that begins with Hugo Baskerville. The story of the legend is told in the 1742 manuscript.
Hugo Baskerville had abducted a peasant girl. She escaped from the room in which he had imprisoned her and fled. He followed on horseback using hounds to hunt her down. His companions followed him, and saw his horse standing riderless and a great black hound tearing out his throat. Since then, several members of the family have died mysterious deaths. The document warns the Baskervilles avoid the moors at night. 
The legend is made relevant by Dr. Mortimer's description of the scene of Sir Charles' death:
Dr. Mortimer looked strangely at us for an instant, and his voice sank almost to a whisper as he answered: "Mr Holmes, they were the footprints of a gigantic hound!” This is the answer! I hope it helped...
 
        
             
        
        
        
When lines of poetry end in words that are spelled alike but pronounced differently ( food – flood)