A company makes a bracelet that is designed to repel mosquitos so people don't have to wear bug spray. Researchers at the company are designing an experiment where volunteers will be assigned either the bracelet or bug spray to use at their homes. The researchers want to use a randomized block design. How should the researchers form the block? (Choose one and explain why, please also explain why other methods wouldn't work). a. Both the volunteers and researchers should be kept blind as to which block the volunteers are in.
b. Each block should consist of volunteers who live in similar environments when it comes to mosquitos.
c. Each block should consist of volunteers who live in different environments when it comes to mosquitos.
d. Each volunteer should be randomly assigned to a block.
e. Volunteers in one block should use the bracelet, while volunteers in the other block should use bug spray.