Identify the best method for a doctor to give a
medicine to a patient if the medicine is required
to act very quickly. Explain your answer.

When a medicine is required to act quickly, the best method for a doctor to give a medicine to a patient is by intravenous way.

Explanation:

There are different presentations of medicines, according to the route you want to use for its administration, either oral, intramuscular or intravenous.

The administration of drugs by intravenous route guarantees a faster therapeutic effect, compared to the oral or intramuscular route.  The intravenous route allows the drug to go directly into the bloodstream, and can reach the site of action very quickly.

Oral drugs must be absorbed into the digestive tract in order to reach the blood, and intramuscular administration also requires a previous step before the drug reaches the blood for transport, so the effect takes more time to become evident.

Learn more:

Intravenous administration of drugs link

i'm pretty sure questions like these aren't allowd.   but, sure.   i can and talk : ))

this would and i think the answer is d