Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 797. Find a linear function S(t), which fits this data, and which expresses score as a function of time.
A) S(t) = -4.425t + 487.25
B) S(t) = 3.9825t + 491.25
C) S(t) = 4.425t + 487.25
D) S(t) = 3.9825t - 491.25