Scarlet Gilia (Ipomopsis Aggregata) Usually Has Red Flowers in an Inflorescence

Scarlet gilia (Ipomopsis aggregata) usually has red flowers in an inflorescence of up to 250 flowers. In certain populations in the Arizona mountains, however, the flowers range from red to pink to white. In early summer, most (but not all) of the flowers were red. Six to eight weeks later, the same individual plants were still present; the flowers ranged from pink to white, and few red flowers were present. The major pollinators early in the season were two species of hummingbirds active during the day; they emigrated to lower elevations, and the major pollinator later in the season was a hawk moth (a type of moth) . The hawk moth was most active at sunset and later, and it preferred light pink to white flowers after dark. When hummingbirds were present, more red flowers than white flowers produced fruit. When only hawk moths were present, more white flowers produced fruit. (K. N. Paige and T. G. Whitham. 1985. Individual and population shifts in flower colour by scarlet gilia: A mechanism for pollinator tracking. Science 227:315-17) .
-Some plants continued to produce only dark (red) flowers whereas others produced lighter coloured flowers later in the season. Which plants do you expect produced more fruit over the entire season?

A) those that changed their colour to a lighter shade
B) those that stayed dark
C) the same numbers of fruit on both
D) the plants whose flowers were always light coloured