How Did Bradshaw and Schemske Alter the Colors in Generations

Multiple Choice

How did Bradshaw and Schemske alter the colors in generations of M.lewisii and M cardinalis,to test pollinator selection?

A) by creating transgenic flowers with the desired color
B) by mating M. lewisii and M cardinalis and then crossing the hybrids to select for the desired color
C) by deleting the YUP locus, removing a specific pigment molecule
D) by duplicating the YUP locus, enhancing a specific pigment molecule
E) by collecting the rare, naturally occurring color variants of M. lewisii and M cardinalis in the wild