Question

people who want to participate in odor studies need to do which two things? a wash with soap that does not have a smell b avoid eating on the day of the study c use a special odor - killing shampoo d not use any deodorant before being tested e sleep in special rooms that are odorless

Explanation:

To avoid interference with odor - related experiments, participants should not use scented products like deodorants. Also, using unscented soap helps in not introducing any extraneous odors. Eating and using special odor - killing shampoo are not typical requirements, and sleeping in odorless rooms is not a common pre - study requirement either.

Answer:

A. wash with soap that does not have a smell
D. not use any deodorant before being tested