Final answer:
An overdraft occurs when money is withdrawn from a bank account, causing the available balance to fall below zero. It is important to properly manage your finances to avoid overdrafts.
Step-by-step explanation:
The correct answer is a) Overdraft. An overdraft occurs when money is withdrawn from a bank account, causing the available balance to fall below zero. In other words, it is when you spend more money than you have in your account. This can result in fees and negative balances, and it is important to properly manage your finances to avoid overdrafts.