An Experiment Examined the Impact of THC (The Active Ingredient

An experiment examined the impact of THC (the active ingredient in marijuana) on various physiological and psychological variables. The study recruited a sample of 18 young adults who were habitual marijuana smokers. Subjects came to the lab 3 times, each time smoking a different marijuana cigarette: one with 3.9% THC, one with 1.8% THC, and one with no THC (a placebo) . The order of the conditions was randomized in a double-blind design.
At the start of each session, no subject reported being "high." After smoking the cigarette, participants rated how "high" they felt, using a positive continuous scale (0 representing not at all "high") . For the placebo condition, participants reported a mean "high" feeling of 11.3, with a standard deviation of 15.5. Is there evidence of a significant placebo effect, with subject feeling significantly "high" after smoking a placebo marijuana cigarette?
What is the P-value for the appropriate test?

A) Greater than 0.10
B) Between 0.05 and 0.10
C) Between 0.01 and 0.05
D) Less than 0.01