Final answer:
The correct answer is D) Discard it according to local hazardous waste regulations.
Step-by-step explanation:
The correct answer is D) Discard it according to local hazardous waste regulations.
Unused perm solution should not be disposed of in the sink or stored for later use. It is important to follow local hazardous waste regulations to ensure proper disposal of chemicals.
Disposing of chemicals down the sink can contribute to environmental pollution and can contaminate water sources. It is always best to consult with your teacher or local authorities on how to properly dispose of chemical waste.