Final answer:
The organs that stretch and signal when a person eats a meal are the stomach and intestines, which are part of the digestive system.
Step-by-step explanation:
When a person eats a meal, the organs that stretch and are signaled are the stomach and intestines. The stomach expands to accommodate the food that is ingested. Nerve cells in the stomach respond to this distension and relay information to the brain. This triggers responses such as the release of digestive enzymes and the increase in blood supply needed for digestion.
The intestines also become active, with smooth muscles in their walls making rhythmic contractions to move the food along the digestive tract. Other organs like the liver, gallbladder, and pancreas aid in digestion by contributing chemicals. The correct option is 1) Stomach and intestines