Final answer:
The Environmental Protection Agency (EPA) is the agency responsible for registering all types of disinfectants sold and used in the United States.
Step-by-step explanation:
The agency that registers all types of disinfectants sold and used in the United States is the Environmental Protection Agency (EPA).
The EPA administers the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and registers all pesticides legally sold in the United States, including disinfectants.
Therefore, the correct answer to your question is EPA.