The given sentence indicates possession. Thus the first blank must be filled with 'of' as it is used to indicate possession. Thus we can eliminate option B and C as incorrect.
In is used to indicate a belief, opinion, interest, or feeling. Thus the second blank must be filled with 'in' as it expresses an interest in getting something in return.
For is used to indicate a space of time, use of something, to show who is intended to have or use something. Thus, 'for' fulfills the last blank.
Hence, option A is the correct answer.