What is the most logical next event?

A girl presses a full lemon on a machine into a cup. The workers add sugar and water before shaking the cup. a straw

Available choices:
(a). skims over a woman's shoulder..
(b). is tilted into the cup and the girl dips a sip into the cup..
(c). is added and the lemonade is placed on the counter..
(d). is held across the machine..
(c).