Thermal neutrons can cause fission in

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(A) Thermal neutrons are neutrons with kinetic energy comparable to the thermal energy of the surrounding environment (approximately $0.025 \ eV$). Fi

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$U^{235}$

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(A) Thermal neutrons are neutrons with kinetic energy comparable to the thermal energy of the surrounding environment (approximately $0.025 \ eV$). Fission of $U^{235}$ is induced by thermal neutrons because the binding energy released upon the capture of a neutron by $U^{235}$ is sufficient to overcome the fission barrier. Other isotopes like $U^{238}$,$Pu^{238}$,and $Th^{232}$ generally require fast neutrons (high kinetic energy) to induce fission. Therefore,the correct option is $A$.

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