Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].
Assertion: Both intake and return side stoppings must closed simultaneously in the event of sealing off a coal mine panel with explosion hazard following a fire.
Reason: By continuously ventilating the area till simultaneously closure of the stoppings, the possibility of an explosion hazard due to gas built is avoided.

A. [a] is true but [r] is false

B. Both [a] and [r] are true and [r] is the correct reason for [a]

C. Both [a] and [r] are true and [r] is no the correct reason for [a]

D. Both [a] and [r] are false

Answer: Option C