Final answer:
The surprising aspect about the identity of the Talib is that he is Amir's old childhood friend, which adds complexity to their interactions. Hence the correct answer is option B
Step-by-step explanation:
The surprising aspect about the identity of the Talib who talks to Amir about taking the boy back is that he is Amir's old childhood friend. This is surprising because it reveals a personal connection between the two characters that adds complexity to their interactions. The reader may not have expected the Talib to have a personal history with Amir, especially given the tense and dangerous situation they find themselves in.
Hence the correct answer is option B