A truck with a weight of $60$ tons travels a distance of $100$ miles. Given an emission factor of $0\mathrm{.}9$ kg of CO$2$ per ton$-$mile, what is the total carbon footprint of this journey?

A$.6666$ kg of CO$2$

B$.54$ kg of CO$2$

C$.5400$ kg of CO$2$

D$.1\mathrm{.}5$ kg of CO$2$