Final answer:
The refer-a-friend program offers a maximum earning of $200 per calendar year.
Step-by-step explanation:
The subject of this question falls under Business and the grade level is High School.
The question asks about the amount of money that can be earned through a refer-a-friend program. The options given are:
A) $25
B) $50
C) $100
D) $200
The correct answer is D) $200, as this option represents the highest amount that can be earned per calendar year through the program.