The reaction is a Diels-Alder cycloaddition between a diene and a dienophile. The given diene is cyclic with two double bonds. The dienophile is an alkene. In Diels-Alder reactions, the product retains the stereochemistry of the dienophile. The dienophile shown has both substituents on the same side (cis), so they will end up on the same face in the product. The correct product is a bicyclic compound where the two -COOCH₃ groups are cis to each other, matching option (B).

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