Bacterial genomics usually means one circular chromosome, but a handful of organisms break this rule. The textbook answer for a two-chromosome genome is Vibrio cholerae.
V. cholerae packages its DNA into two circular replicons: a large chromosome (~3 Mb) holding the bulk of housekeeping and virulence genes, and a smaller second chromosome (~1 Mb) that evolved from an integrated megaplasmid but is now essential for viability. Both replicate in a coordinated fashion during cell division.
The remaining choices each have the conventional single circular chromosome: E. coli (with accessory plasmids), the slow-growing GC-rich M. tuberculosis, and the minimalist wall-less Mycoplasma genitalium.
\[\boxed{\text{Two circular chromosomes} \Rightarrow \textit{Vibrio cholerae}}\]