Final answer:
The statement is true as involuntary muscles line the esophagus and perform peristalsis to move food toward the stomach, a process that is involuntary and essential for digestion. The correct option is A.
Step-by-step explanation:
The statement that involuntary muscles line the esophagus, and their movement is called peristalsis is true. These smooth muscles engage in a series of wave-like contractions that push the food from the mouth toward the stomach.
This rhythmic process occurs as a response to swallowing and continues until the food reaches the stomach through the esophagus. The gastro-esophageal sphincter, a ring-like muscle at the stomach end of the esophagus, opens to allow the passage of food into the stomach and closes to prevent the stomach contents from returning to the esophagus.
This movement is critical for the proper functioning of the digestive system and occurs without our conscious control.