What Hypothesis Were the Researchers Testing

What hypothesis were the researchers testing?

A) That mutation in a single gene could cause a change in flower color and thus pollinator
B) That mutation in multiple genes over a long period of time is required to change flower color and pollinators
C) That pollinators do not choose which flowers to pollinate based on color
D) That M. lewisii and M cardinalis are the same species
E) That M. lewisii and M cardinalis are different species