84 pts ! and BRAINLIEST TO FIRST CORRECT ANSWER
Marika is training for a track race. She starts by sprinting 100 yards. She gradually increases her distance, adding 4 yards a day for 21 days. Which explicit formula models this situation?
A. an = 21 + (n – 1)4
B. an = 4 + (n – 1)100
C. an = 100 + (n – 1)4
D. an = 100 + (n – 1)21