Which will reduce the possible environmental damage associated with mining uranium?

We need to discuss about reduction of possible environmental damage associated with uranium mining.

There are several extraction processes involved in mining uranium as- (i) surface mining, (ii) heap leaching, (iii) underground mining and so on.

There are so many risks involved towards environment and health.

There are some improvements for long term stabilization of Uranium mining have been documented. They are as follows-back-filling and  using residues for the construction of motorways, washing of soil with water, carbon treatment inclusion of new materials like room temperature ceramics for the immobilization of various contaminants, de-watering, and land encapsulation.

i'm pretty sure it is letter c.) car