During a normal Swallowing sequences ,the smooth muscle which surrounds the gastro esophageal junction.

• A. Remains tonically constricted until the bolus arrives at this junction.
• B. Relaxes even before the oncoming peristaltic wave has arrived.
• C. constricts further on the passing bolus and allows a gradual esophageal emptying.
• D. Is never constrict at all , and has no participation of any kind in the Swallowing process.