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B) Both present forbidden love.
Explanation: The themes of "Romeo and Juliet" by William Shakespeare and "Pyramus and Thisbe" by Ovid are similar, because they both present forbidden love. In Romeo and Juliet, they are in love despite of the rivalry of their families (the Montague family and the Capulet family). Pyramus and Thisbe are two lovers in the city of Babylon who lived in connected houses, they were forbidden by their parents to be wed, because of their parents' rivalry. Also in both stories, the forbidden love, produces a lot of tragedy.