Answer:
The sum of the debits will exceed the sum of the credits by $340. (None of the options given).
Explanation:
The right posting on the payment of $210 for the purchase office supplies would be;
Debit office supplies account $210
Credit Cash account $210
However since the debit to office supplies was $550 which is 340 (i.e $550 - $210) more than what the amount to have been posted is, it means that the sum of the debits will exceed the sum of the credits by $340.