Refer to the Figure

Refer to the figure.
Crickets can most easily hear sound frequencies when the intensity threshold is low. When crickets hear a low frequency sound, they turn toward the source of the sound. When they hear a high-frequency sound, they turn away. The "intensity threshold" on the graph refers to the

A) loudest sound of a given sound frequency that a cricket can hear.
B) softest sound of a given sound frequency that a cricket can hear.
C) most intense response given by a cricket to a given sound frequency.
D) least intense response given by a cricket to a given sound frequency.