With reference to coward diagram, match the following the context of explosibility of a mixture of normal air and methane air

O2% ; CH4%	Mixture Status
a. 20.5 ; 2.4	1. Impossible mixture
b. 19.0 ; 9.5	2. Non explosive
c. 17.0 ; 19	3. Potentially Explosive
d. 20 ; 19.5	4. Explosive

A. a-2, b-4, c-3, d-1

B. a-2, b-4, c-1, d-3

C. a-2, b-3, c-1, d-4

D. a-3, b-2, c-1, d-4

Answer: Option A