Select the correct answer.

A $70$ kilogram mountaineer is standing on the summit of Mt$.$ Everest. The distance between the mountaineer and the center of Earth is $6\mathrm{.}39106$ meters. What is the magnitude of the force of gravity acting on the mountaineer? $($The value of G is $6\mathrm{.}67310-11$ newton meter$2/$kilogram$2.$ The mass of Earth is $5\mathrm{.}981024$ kilograms.$)$

A$.$

$90\mathrm{.}5$ newtons

B$.$

$179$ newtons

C$.$

$684$ newtons

D$.$

$781$ newtons