Question

read the text.
when the apollo 13 mission took off, its goal was to land on the moon. however, before it reached the moon, an onboard oxygen tank exploded, damaging the spacecraft and reducing its power. the astronauts faced a life - threatening situation. nasa quickly developed an emergency plan. the three astronauts climbed into the lunar landing module onboard the spacecraft. though initially intended to keep two men alive while landing on the moon, the lunar module would now help all three return home. the astronauts rerouted their ship to slingshot around the moon, using the moons gravity to propel them back to earth. they survived to land safely back in the ocean.
which organizational structure does this text primarily use?
compare - contrast
problem - solution

Explanation:

The text first presents a problem: the Apollo 13's oxygen tank exploded, creating a life - threatening situation for the astronauts. Then it describes the solution: NASA developed an emergency plan, the astronauts used the lunar module and a slingshot - around - the - moon maneuver to return to Earth safely. There is no comparison or contrast between different things in the text, so the organizational structure is problem - solution.

Answer:

problem - solution