Jonas is extremely anxious about speaking in public. This anxiety does not simply apply to giving speeches, but even to speaking in a conversation with another person, ordering a meal from another person, making a docto's appointment and so forth. Because of his extreme anxiety, he rarely does these activities, and finds a way around them. For example, he will not eat out at all, and his sister makes most of his doctors appointments for him when necessary. Jonas's strategies for not engaging in these activities illustrates a key feature of anxiety known as:_______

a. Behavioral avoidance.
b. Worry.
c. Physical arousal.
d. Catastrophizing.