The correct answer to question 1 is C. "His friends were those of his own blood or those whom he had known the longest;"
Obviously, in order to trust someone, there must be a special bond that unites them together for a long time.
The correct answer for question 2 is C. "undemonstrative at the best"
right after that sentence, it says that Mr. Utterson had a good nature.
The correct answer to question 3 is B. They do not understand why the men are friends.
People did not comprehend the bond they had as friends and they were astonished by their friendship.
