Amongst the following, the fissionable materials are

• A. U₂₃₃ and Pu₂₂₉
• B. U₂₃₁ and Pu₂₃₃
• C. U₂₃₅ and Pu₂₃₅
• D. U₂₃₈ and Pu₂₃₉