Analyze the word to determine its greek prefix. then use your understanding of the prefix meaning to choose the correct meaning of the word.

monopoly

a situation in which one company controls an entire commercial activity

a situation in which a commercial activity is managed by many companies

The prefix "mono" means one, and you hear it in words like "monogamy," which means attachment to one single partner, or "monologue," which is when one actor in a show or play has an ongoing speech.

so, with that in mind, monopoly will relate to one company rather than many.

(also: for future reference, "poly-" is the prefix for many, so the absence of that could have thrown you off of the second answer as well)

Ithink it's the first one too