Answer:
The answer is letter a.
Step-by-step explanation:
When it comes to filing an income tax, people need to follow certain rules set by the government. One of these rules is filing the "Federal Income Tax."
Federal Income Tax refers to the tax that a person needs to file when his gross income (total income before deductions) is more than his gross income threshold. The amount that a person needs to file is dependent on his amount of income level and on four factors: his age, status, whether he's blind or has someone dependent on him.
The gross income here refers to the income that the person receives without the tax deductions. In the situation above, Mario's gross income exceeded the gross income limit for him, thus he is required to file a federal tax return.
Thus, this explains the answer.