Fill in the blank with the most appropriate option.
The Universal Constant of Gravitation is ..........

A

$$6.67 \times 10^{10}  Nm^2/kg^2$$

B

$$6.76 \times 10^{-10}  Nm^2/kg^2$$

C

$$6.67 \times 10^{-11}  Nm^2/kg^2$$

D

$$9.8  Nm^2/kg^2$$