Question

saving the apollo 13 mission
on april 11, 1970, apollo 13 was launched for a planned moon landing. two days into the mission, however, one of the oxygen tanks in the spacecraft exploded, causing a loss of air, electricity, and water. the moon landing had to be canceled, and the astronauts had to figure out how to get home. their solution was to move into the lunar module, the small craft that was supposed to land on the moon, for much of the remaining trip. the lunar module contained fewer supplies, however. therefore, the astronauts had to conserve as much food and water as possible. by firing the lunar modules engine, the men were able to get the spacecraft on the correct course to return to earth. on april 17, apollo 13 landed safely in the pacific ocean.
what is the main, or central, idea of the passage?
after an explosion on apollo 13, the astronauts had to conserve supplies.
after an explosion on apollo 13, the astronauts took shelter in the lunar module.
after an explosion on apollo 13, the spaceship began to lose air, water, and power.

Explanation:

The passage details the Apollo 13 mission's explosion, the astronauts' actions (using the lunar module, conserving supplies, firing the engine) to return safely. The main idea should encompass the overall event of overcoming the explosion to return. The first option only focuses on conserving supplies (a part of the story), the second only on taking shelter (a part), the third only on losing resources (a part). The full story is about the explosion and the subsequent steps to return safely.

Answer:

None of the provided options fully capture the central idea. The central idea is that after an explosion on Apollo 13, the astronauts took multiple actions (using the lunar module, conserving supplies, firing the engine) to return safely to Earth.