Final answer:
The priority deadline for students to fill out the FAFSA in order to receive the maximum amount of aid they are eligible for is March 15.
Step-by-step explanation:
The priority deadline for students to fill out the FAFSA in order to receive the maximum amount of aid they are eligible for is option A) March 15. By submitting the FAFSA before this deadline, students have a higher chance of receiving more financial aid as it is awarded on a first-come, first-served basis. Many states and colleges also have their own deadlines, which may be earlier than the federal deadline, so it's important to check their individual requirements.
For example, some states have limited funds and may run out of financial aid for late applicants. Additionally, some colleges use the FAFSA to determine eligibility for their own institutional aid, so their deadlines may be earlier than the federal deadline as well.