Final answer:
Alcohol increases blood flow and swelling to an injured area and can mask the pain, correlating with Option 3 as the correct answer.
Step-by-step explanation:
The effect of alcohol on an injury includes increasing blood flow, swelling, and potentially acting as a mask to the pain, therefore the correct answer is Option 3. The presence of alcohol in the body affects various biological processes. For instance, alcohol can cause vasodilation, which increases the blood flow to an injury site. This elevated blood flow can lead to further swelling and inflammation and exacerbate redness and warmth. Additionally, alcohol has a sedative effect at higher doses, which can dull the sensation of pain, giving the impression that it is acting as a pain reliever while it could be causing more harm by masking warning signs of a worsening condition.