Right choice is (a) Solanum tuberosum
Explanation: Solanum tuberosum (Potato) (Species: Tuberosum; Genus: Solanum); Ipomoea batatas (Sweet potato) (Species: Batatas; Genus: Ipomoea); Phaseolus vulgaris (Beans) (Species: Vulgaris; Genus: Phaseolus); Daucus carota subsp. Sativus (Carrot) (Species: Carota; Genus: Daucus).