A Hot, Wet Summer Is Causing a Mosquito Population Explosion $2,100+7 e^{0.7 t}$

Multiple Choice

A hot, wet summer is causing a mosquito population explosion in a lake resort area. The number of mosquitoes is increasing at an estimated rate of $2,100+7 e^{0.7 t}$ per week (where t is measured in weeks) . By how much does the mosquito population increase between the 4th and 6 th weeks of summer?

A) $4702$
B) 7702
C) 5702
D) 6702
E) 8702