Researchers Wished to Determine If a New Experimental Medication Will

Researchers wished to determine if a new experimental medication will reduce the symptoms of allergy sufferers without the side effect of drowsiness.To investigate this question,the researchers gave the new medication to 50 adult volunteers who suffer from allergies.Forty-four of these volunteers reported a significant reduction in their allergy symptoms without any drowsiness.What are the experimental units in this study?

A) The researchers
B) The 50 adult volunteers
C) The 44 volunteers who reported a significant reduction in their allergy symptoms without any drowsiness
D) The six volunteers who did not report a significant reduction in their allergy symptoms without any drowsiness