Choose the correct alternative:

Statement 1:  It is dangerous to sleep in a closed room where coal is burning.

Statement 2:  Incomplete combustion of carbon particles produces carbon dioxide.

Both statements are true and statement 2 is the correct reason for statement 1.

Burning coal in a closed room result in incomplete combustion of carbon particles due to which carbon monoxide is released, a highly poisonous gas that causes suffocation or even death. So both statements are correct and statement 2 is the reason for statement 1.