What is one downside for consumers to competition in a free-enterprise system?

I believe the answer is: Consumers must be knowledgeable

Competition in the free market encourage producers to keep reducing the cost to make their products so it come up cheaper compared to competitors' products. This improve the chance of them using materials or methods that are dangerous for the consumers. Consumers need to be knowledgeable to distinguish the things hat might endanger us and which things are not.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; ewing's sarcoma;