The gerund in this sentence is "learning". A gerund is a verb form which is acting as a noun, in this case after the preposition "in".
 
        
             
        
        
        
Answer:
i dont know about this one
Explanation:
 
        
             
        
        
        
Answer:
People are or seem to be difficult because they are layered, behind each of their actions and behaviours there are a hundred reasons 
 
        
             
        
        
        
Answer:
E: all of the above
Explanation:
  All the points presented have some advice on how to create a more formal and professional tone in writing communication:
A and B: Mentioning the request in advance , and  better explaining  the purpose shows respect and consideration.
C and D: informal language and contractions  are not fit for fomal and professional writing.