Final answer:
The pesticide re-entry interval (REI) tells you how much time must pass before people can re-enter a treated area without appropriate protective clothing.
Step-by-step explanation:
The pesticide re-entry interval (REI) refers to the amount of time that must pass before people can re-enter a treated area without appropriate protective clothing. The REI is important for ensuring the safety of individuals who may come into contact with pesticide residues. It helps to minimize the risk of exposure to harmful chemicals. Therefore, the correct answer is option d. How much time must pass before people can re-enter a treated area without appropriate protective clothing.