The correct answer is C. Stealing credit card information.
Skimming is a method of stealing credit card information by using a device to read the information off the magnetic stripe on the back of the card. This information can then be used to make fraudulent charges on the card.
Option A is incorrect because skimming does not involve converting debit cards into credit cards.
Option B is incorrect because skimming does not involve transferring cash from one account to another account.
Option D is incorrect because skimming does not involve intimating the customer about his-heavy withdrawals.