Which question can best be used to find the central idea when reading a text? Why was the text written?
What is this text mostly about?
Is the text meant to inform, argue, or entertain?
Which words or phrases are important in the text?

D (it's a sort of trick question

Explanation:

here ya go ;)

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.