Based on Priyanka's reaction of sitting alone quietly and looking at blades of grass, after taking a drug, she most likely took LSD.
Lysergic Acid Diethylamide (LSD) is a drug that causes a person to develop intensified thoughts and sensory perception.
Priyanka most likely took LSD because her thoughts have been intensified such that she is focusing on mundane things such as a blade of grass.
In conclusion, she probably took LSD.
Find out more on LSD at https://brainly.com/question/1594150.