Dr Taylor Is Conducting a Study in Her Introductory Biology

Dr. Taylor is conducting a study in her Introductory Biology class to determine if taking vitamin W can improve tests scores on the first exam. She puts all of her students' names in a hat and has her teaching assistant draw names to determine which students will be placed in the control or the experimental group. The experimental group receives a capsule of vitamin W, while the control group receives a "sugar pill" that tastes and looks identical to the vitamin capsule. Dr. Taylor, her teaching assistant, and the students do not know who is receiving the experimental or control treatment. This experiment is best described as

A) single-blind, random selection.
B) double-blind, placebo controlled.
C) single-blind, random selection, placebo controlled.
D) double-blind, random selection, placebo controlled.