Answer:
Maria should use Schedule C to report her business income.
Step-by-step explanation:
Anyone who is running a business (as a single owner not in partnership) has to fill the Schedule C form while filling annual tax returns.
Schedule C:
It is profit or loss form of a business and tells the income as well as deductible expenses of a business for a tax year.
Note:
If someone is operating more than one business then he or she has to file a separate Schedule C for each of business.