We have enough coal in the us to last us for a maximum of years.
a. 225
b. 10
c. 100
d. 50

It is very often claimed that the amount of coal that is present on Earth as of the moment will last us several hundreds of years. However, World Coal Association reported that at the current rate of coal usage, deposits will only last for approximately 110 years. Thus, the answer should be letter C. 

Answercompass direction;