Advantages corporations brought to the American consumer did not include:

I believe that you forgot the options, but i think i know them.

So, one of then is that it employed more workers: true they did bring it. Another option is that they brought lower prices: true as well

another option is that they brought better quality products, and this is also sometimes true.

The correct answer is : monopolies, which in any case would not be an advantage for the consumer.