Refer to the Hypothetical Data Set Comparing the Gene Content

Multiple Choice

Refer to the hypothetical data set comparing the gene content of Salmonella and Shigella, of which all strains are pathogenic, and the pathogenic and nonpathogenic strains of E.coli.(Note: "x" denotes presence of the gene.) Which is the most likely conclusion about gene A?

A) It may be involved in pathogenicity and was acquired from Salmonella strain 1.
B) It may be involved in pathogenicity and was acquired from Salmonella strain 2.
C) It may be involved in pathogenicity and was acquired from Shigella.
D) It may be involved in pathogenicity, and its origin is unclear.
E) It is unlikely to be involved in pathogenicity.