Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

Geothermal fluids drawn from underground carry dissolved salts and toxic contaminants like hydrogen sulphide and oxides of nitrogen.

The Assertion is correct about this contaminated nature of geothermal fluids.

The Reason is also correct because such fluids are re-injected into the ground rather than being discharged into rivers or ponds.

Re-injection is the disposal practice used, but it explains how the fluids are handled, not why they are contaminated in the first place.

The contamination arises from contact with hot subsurface rocks, while re-injection is a separate management step.

Re-injection also helps maintain underground pressure and sustain the geothermal reservoir.