A posting to the debit side of a ledger account will, where applicable, always have the effect of...

This is a very odd question and while I know what your teacher is getting at it terribly worded. Also realize that homework questions are not answered outright here. You first need to give us what you think the answer is and why, then we will help you through it. HINT: I'm assuming I know what your teacher is getting at, what accounts in the ledger increase with a debit and which increase with a credit.

Decrease in the balance of an asset account