Which of the following descriptions is an example of a fixed-action pattern?
a. a crane in a captive-breeding program imprinting on its human caregiver
b. a male stickleback chasing a red-bellied object from its territory
c. a black cap migrating to its winter territory
d.a songbird learning its song after listening to a tape of its species' song
. a digger wasp returning to its nest with the aid of landmarks