To disinfect using 5.25% bleach, the recommended dilution is generally about 1 cup (8 ounces) of bleach per gallon of water for general disinfecting purposes. However, if we are looking at your options and want to calculate the amounts logically based on a lower concentration for specific tasks:
The common ratio for a disinfecting solution is around 1/4 cup of bleach per gallon of water, which aligns with your options provided.
So, the correct response from the options given would be:
1/4 cup