It seems that you have missed the given choices of this question which are the following:
A) grants & scholarships-money you earn
B) federal student loans-free money
C) 529 plan-money you save
D) federal work-study program-money you borrow
Anyway, based on the given choices above, the option that correctly pairs a financing option with its description is option C. 529 PLAN-MONEY YOU SAVE. 529 Plan is a tax-advantaged savings plan which allows you to encourage saving for future college costs. Grants and scholarships means free money. Federal student loans is the money you borrow, and federal work-study program is the money you earn.