Question

improvements in which area would help reduce the possibility of damage to the environment when using uranium as a fuel?
more-efficient extraction techniques
better control of fusion reactions
stronger-pumping wells
thicker shielding around the reactor

Explanation:

• Uranium is used in nuclear fission reactors (not fusion). More - efficient extraction techniques would reduce the amount of uranium ore that needs to be mined, processed, and the associated environmental impacts like land disturbance, water pollution from mining chemicals etc. Stronger - pumping wells are more relevant in oil/gas extraction or groundwater management. Thicker shielding around the reactor is mainly for protecting workers and nearby populations from radiation during normal operation and in case of an accident, not directly for reducing environmental damage in the broader sense (like mining - related impacts).

Answer:

more - efficient extraction techniques