According to Studies About Flirting Completed by Givens (1983) and Perper

According to studies about flirting completed by Givens (1983) and Perper (1985) , the more that potential partners _______________________, the more likely they are to take the next step in the romantic encounter.

A) mimic each other's emotional expressions
B) show off signs of their social status (e.g., raising their arms to show of a flashy watch)
C) gaze intently at each other
D) touch each other on the arm