Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to prove the earth is round [title] Stick 2 toothpicks into the side of an orange. [step] Place the toothpicks about 1 inch (2.5 cm) away from each other. In this experiment, the orange will represent the earth, and the toothpicks will represent objects located in 2 different countries on earth.

Ending1: [title] Put the toothpicks farther apart than you need them to be. [step] Point the toothpicks at a distant object, such as a tree branch, or a person in the wilderness. Ending2: [title] Turn off all the lights and shine a flashlight on the toothpicks. [step] The flashlight will represent the sun in this experiment. Ending3: [substeps] If you find that one toothstick breaks during the experiment, then the orange is the sun. If you find that one toothstick breaks during the experiment, then it is a moon. Ending4: [title] Measure 2 " x 1 " in front of you and place the pointed end of a 4-inch (10-cm) stick between the two toothpicks. [step] To do this, place the flat end of the stick between 2 toothpicks.

Answer format: ending1/ending2/ending3/ending4