What is the effect of the narrator's description of the uncle reading the aunt's letter?

a) It provides readers with a complete picture of the uncle's character.

b) It adds mystery for readers as to the real reason why the uncle accompanies the mother and the narrator to Slovakia.

c) It reveals the real reason why Great-Aunt-Gertrude moved to the United States to be near family.

d) It adds surprise for readers of what the family learns about Great-Aunt Gertrude and her life.