After reading "How Santa Claus Found the Poor-House," by Sophie Swett, we can say that the quotation that gives evidence to Part A is:
C.  "He had become so accustomed to looking for a bright side that he could find one when you wouldn't have thought there was any there." ( Paragraph 28)
In Part A, we were asked about how Gobaly's attitude changed while he was shoveling snow. 
The answer is that he was initially upset that it would not be a happy Christmas. However, his conversation with Methuselah reminds him to be positive.
Methuselah is weaker than Gobaly, so Gobaly feels very protective of him. They are both orphans who live at the Poor-House.
Whenever Gobaly is around Methuselah, he looks for the bright side of things so that his friend will be happy.
In their conversation about Christmas, Gobaly is trying to cheer Methuselah up. That is what makes his attitude change.
With the information above in mind, we can choose letter C as the best option.
Learn more about "How Santa Claus Found the Poor-House" here:
brainly.com/question/20461169
 
        
             
        
        
        
I don’t understand your question
        
                    
             
        
        
        
He reads, educates himself
        
             
        
        
        
The principal structural characters effected were in the postcranial anatomy, especially in the skeletal and muscular systems.