Final answer:
The correct answer is A. Administer milk or water. Swallowing drain cleaner is a medical emergency and immediate action needs to be taken.
Step-by-step explanation:
The correct answer is A. Administer milk or water.
Swallowing drain cleaner is a medical emergency and immediate action needs to be taken. The primary concern is to dilute the drain cleaner as quickly as possible. Administering milk or water is important because it helps to dilute the chemicals and reduce their harmful effects.
However, it is important to note that milk or water should not be given if the person is experiencing difficulty swallowing, is unconscious, or is having seizures. In such cases, immediate medical attention should be sought by calling medical control.