Which of the following was a belief held by progressive reformers? a. big businesses should be regulated by government to small businesses. b. america should take new territory from mexico. c. regulations weren't needed to run an efficient economy. d. the spoils system was a great way to run government.

The answer is letter a. Big business should be regulated by government.  Many progressives believed that when big business runs unchecked not only does it destroy smaller businesses but also increases the gap between the rich and the poor because it tends to take all the profits leaving those who worked so hard with very little.  Sometimes big business left unchecked can also resort to unlawful business operations that destroy lives.

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explanation:

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer