Betty, a salesperson, presents her company's new luxury car to customers. During the presentation, she notices that some of the company's important customers are blinking rapidly, almost at a rate of $50-60$ blinks per minute $($bmp$).$ In this scenario, Betty should be

concerned because it indicates high stress levels.

entertaining because her customers are getting bored.

excited because it suggests that the customers are highly interested.

agitated because it suggests coldness and dislike.

relaxed because it indicates that the customers are ready to close the deal.