During the Gilded Age, reform laws regarding the government regulation of business were

extremely effective.

somewhat effective.

effective most of the time.

Verified Answer :

During the Gilded Age, reform laws regarding the government regulation of businesses were not effective at all. The businesses were thriving during this period without the government having to control or set any regulations.
The answer is not found in any of your choices.

It's "somewhat effective" so therefore your answer is letter C or the third option.