Carpenter and Colleagues (1983) Describe the Territorial Behavior of a Migrating

Carpenter and colleagues (1983) describe the territorial behavior of a migrating rufous hummingbird (Selasphorus rufus) as it paused for five days in southern California during its southward migration. It ended up maximizing its weight gain during the rest period by

A) enlarging its territory bit by bit over the course of each of the five days.
B) fiercely defending its territory as originally established on the first day.
C) first expanding its territory size over three days and then reducing it slightly over the next two.
D) reducing the size of its territory day by day for the five day period.