Which type of fuel must be the most carefully contained and protected

Nuclear fuels must be the most carefully contained and protected fuel.

Explanation:

Nuclear fuels must be the most carefully contained and protected fuel.

Nuclear fuels are the materials which are radioactive,

They undergo fission reaction to produce large amount of energy in a specially designed reactor known as nuclear reactor.

The commonly used fuels are uranium-235 and plutonium-239.

They must be handled properly as any leakage may lead to tremendous damage to humans and other living organism.

c. orbital shape i hope this is correct