Match the following in the context of underground mine environment

Instrument	Measuring parameter
P. Haldane apparatus	I. Humidity
Q. Godbert-Greenwald apparatus	II. Air velocity
R. Hygrometer	III. Mine air composition
S. Anemometer	IV. Ignition point temperature

A. P-II, Q-I, R-III, S-IV

B. P-III, Q-IV, R-I, S-II

C. P-IV, Q-II, R-III, S-I

D. P-I, Q-III, R-IV, S-II

Answer: Option B