Refer to the Figure

Refer to the figure.
Top: An illustration of the single plotted actogram depicts the circadian rhythm of calling in Australian black field cricket during the day schedule, which shows the male crickets were kept constant in light for 24 hours. Bottom: An illustration of the single plotted actogram depicts the circadian rhythm of calling in Australian black field cricket during the day and night schedule, which shows the male crickets were kept constant in light for 12 hours and the next 12 hours, male crickets were subjected to dark.
The bottom figure demonstrates that in an alternating light and dark environment, male crickets

A) are unable to maintain a regular cycle of calling.
B) call continuously throughout the day due to the constant light input.
C) maintain a daily cycle of calling and noncalling that starts slightly later each day.
D) reset their calling cycle to start a few hours before the lights go off and continue until a few hours before the lights go on.