Trick method
As this is an asynchronous circuit containing T flip Flops such circuits are either down counters or up counters
Up Counter
when we have +ve edge triggered clock for next T flip flop i.e T responds if previous output changes from 0-1
Down Counter
when we have -ve edge triggered clock for next T flip flop i.e T responds if previous output changes from 1-0
here it is a down counter so it will count 3->2->1->0
Option (A) answer