The most likely impact on John's account is that a. John's Savings account balance declined by $50 and his Checking account balance increased  by $50.
The description of the transfer says, " From Savings," which means that the transfer was done from John's saving account. This would therefore reduce his savings account.
As the only other account mentioned is the Checking account, the money must have gone to the Checking account which means that the Checking account will increase.
The other options are wrong because:
In conclusion, the transfer was from John's Savings account so the Savings must have decreased and the Checking Account increased.
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