Read the excerpt from Team Moon. The trouble with option 2 was that the venting might push the fuel to an unstable condition. Or, another possible outcome of the “burping”: what if the landing gear hadn’t deployed correctly? Could any movement, or any resulting burst—no matter how small—tip the LM over? Many a voice in the debate thought the safest option was to abort—now! But that opinion was quickly overruled by the Grumman and NASA leadership (who were confident of the landing gear), and the consensus of the leaders was that it would be safe to gently, gently burp the engine.

Why does the author use a problem-solution text structure in the paragraph?

a. to help the reader understand the astronauts’ feelings about the landing
b. to help the reader understand the intense pressure of the situation
c. to help the reader understand the similarities between the leaders’ options
d. to help the reader understand the process of “burping” an engine