How Did Adkins-Regan and MacKillop (2003) Demonstrate a Link Between

How did Adkins-Regan and MacKillop (2003) demonstrate a link between classical conditioning and fitness in quail?

A) Birds had higher reproductive success in the cage in the condition in which they learned mating occurs
B) Males had lower reproductive success in the condition in which they learned mating occurs
C) Females learned an association between a chemical alarm substance and a novel predator
D) Birds had higher survivorship when they learned an association between chemical alarm substance and predators
E) Conditioning led to higher food intake rates for all birds