Define restricted-entry interval (REI) and preharvest interval (PHI), and explain how they affect field work and harvest timing.

• A. REI is the waiting period after application before unprotected workers can re-enter; PHI is the time before harvest when the crop may not be sold or consumed, determining when entry is permitted and when harvest can occur.
• B. REI is the time before application when workers must be trained; PHI is the maximum residue limit set by EPA.
• C. REI is the waiting period after application before re-entry; PHI is the time after harvest when residues must be tested for clearance.
• D. REI refers to storage duration; PHI refers to disposal timing.

Answer: (C)