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Pair (b,c) repel each other which means they have same charge.
pairs (a,b) and (c,e) attract each other so they have opposite charges.
From above relation, balls a and e both have same charge but in question pair (a, e) shows attraction which is not possible.
so the only option left here is C which is ball a is uncharged
pairs (a,b) and (c,e) attract each other so they have opposite charges.
From above relation, balls a and e both have same charge but in question pair (a, e) shows attraction which is not possible.
so the only option left here is C which is ball a is uncharged
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