The critical mass of fissionable $U^{235}$ can be reduced by

adding impurities

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heating material

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surrounding it by a neutron-reflecting material

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surrounding it by a neutron-absorbing material

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Solution

The correct option is B surrounding it by a neutron-reflecting material
Surrounding a spherical critical mass with a neutron reflector reduces the mass needed for criticality.
A common material for a neutron reflector is beryllium metal.

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