Suppose a scientist isolates a bacterial species that is 1 of the 4 species used in Experiment 1. She adds the species to sucrose broth and observes that neither acid nor CO2 is produced. She then adds the species to lactose broth and observes that both acid and CO2 are produced.Based on the results of Experiment 1, the species is most likely:

A. Species A.
B. Species B.
C. Species C.
D. Species D.