A: p = 0.42+ s, where s is time and p is the number of people
B: s = 0.42p2, where s is time and p is the number of people
C:p = 0.42+ s, where s is time and p is the number of people
D:s = 0.42p, where s is time and p is the number of people
The answer is letter D. Hope it helps.