The reaction A⟶B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1h. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?
A. 0.25h
B. 2h
C. 1h
D. 0.5h