|A.||it is difficult to initiate fusion reaction.|
|B.||it is difficult to control fusion reaction.|
|C.||the fuel required (e.g. deuterium and tritium) is scarce.|
|D.||quantity of fuel required for initiating fusion reaction is prohibitively high.|
Explanation:it is difficult to control fusion reaction.
|A.||fusion of atoms of uranium.|
|B.||fission of U-235 by neutrons.|
|C.||absorption of neutrons in uranium atoms.|
|D.||combustion of a nuclear fuel e.g. uranium.|
Explanation:fission of U-235 by neutrons.