A gas based geyser heats water flowing at the rate of 5.0 litres per minute from 27°C to 87°C. The rate of consumption of the gas is ___ g/s. (take heat of combustion of $$gas=5.0\times10^{4}J/g$$) specific heat capacity of water =4200 J/ kg.°C

A

0.42

B

0.21

C

2.1

D

4.2