The correct answer is B - the writer's identity. 
Imagine if you received a letter, and you start reading it, but you have no idea who is it from! It would be confusing. The day, who you are, and your information will be located at the top of the letter, then include the name and information of the person receiving, in the same format.  
Example: 
(Insert your name) 
123 ABC St.
New York City, NY 99999
April 1st, 2017
Dr. Patricia Brown
777 West Ave.
Los Angeles, CA 111111
Dear, Dr. Patricia Brown, 
(Purpose for writing goes here)
(An expression of thanks) 
Sincerely,
(Insert your name) 
 
 
        
             
        
        
        
Answer:
it is not right because they aint the same?!!!!?
 
        
             
        
        
        
Let the price of single algebra book = x
and the price of geometry book = y
 Then equation (1) = 2x+3y=34
 3y= (34 - 2x)
 y= (34 - 2x)/3
 And equation (2) = 3x + 2y=36
 put value of y in equation (2)
 3x + 2 (34-2x)/3= 36
 9x + 2 (34-2x)=108
 9x + 68 - 4x=108
 5x=40
 x=8
 put x=8 in equation ( 1 )
 2(8) + 3y= 34
 16+3y=34
 3y=18
 y=6
 Hence, price of algebra book = 8$ and price of geometry book=6$
        
             
        
        
        
This is Mrs White. She is a primary school teacher.
She teaches English, Maths and Geography.
At the moment, she teaches Maths.
She lives in London and is married to Georges, who is French. They have three children. They
all love animals, but they do not have any pets
because they live in an apartment. Mrs White speaks French as well as English, but she does not teach it. Mrs White's niece Sophie stays with the Whites for a few days. Sophie
lives and studies in Liverpool.
 
        
             
        
        
        
Answer:
I would say intensive.
The word that would be reflexive or intensive is <u>ourselves</u>. It's intensive because it isn't necessary. If you took the word out the sentence, the point would still get across.
hope this helps