Final answer:
Misoprostol is the medication that can be injected into the cervix to reduce bleeding during vaginal procedures, as it promotes vasoconstriction and uterine contractions. The correct option is 3.
Step-by-step explanation:
The medication that can be injected into the cervix during vaginal procedures to reduce bleeding is Misoprostol. Medications such as ibuprofen, acetaminophen, and aspirin are not typically used for this purpose. Misoprostol is a medication that has properties to induce smooth muscle contraction and is often used in obstetric and gynecological procedures.
Unlike nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and aspirin, which act by inhibiting the synthesis of prostaglandins and can lead to increased bleeding times, misoprostol can be used to prevent hemorrhage during certain medical procedures by taking advantage of its ability to cause vasoconstriction and uterine contractions.