Antispasmodics are used to:

Antispasmodics are medications specifically designed to relieve muscle spasms, particularly in the smooth muscles of the gastrointestinal tract. This makes them particularly effective for conditions that involve painful muscle contractions, such as irritable bowel syndrome or acute abdominal pain. By relaxing these muscles, antispasmodics can help alleviate discomfort and improve the functioning of the digestive system.

The other options do not align with the primary function of antispasmodics. Reducing itching relates to antihistamines or topical steroids, while treating hypertension typically involves antihypertensive medications. Preventing blood clots is a function of anticoagulants or antiplatelet drugs, which target different mechanisms in the body unrelated to muscle spasms. Therefore, the use of antispasmodics primarily centers around the control of muscle spasms within the stomach and intestines, confirming why the chosen answer is correct.