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when we are inside the " if (x.total<avgT) " condition:
Then I assume The marks in any 1 subject is already lesser than average mark in that subject.
i.e Among inner 3 if conditions, Any one must be true. Hence SubC can never be 0. It can be 1 or 2 or 3.
So we reach our block of "fill the code", which is inside the parent if block, then for option (a) :
'''if (SubC <= 1){
countBA = countBA +1}'''
The SubC can either 0 or 1, but as we are already inside parent if condition hence, subC must not be 0. That is for required case
subC would be 1. i.e As (SubC < = 1) is the same as SubC == 1 because SubC cannot be 0 as the X.total is less than average_total score in a card X.
Regards.