Read the passage. which sentence from the text is an opinion that needs more support to be considered valid? as a result, southern plantations increased their production of cotton from 750,000 bales in 1830 to 2.85 million bales. ." if whitney had known the effects his invention would have on slavery, he never would have created it. "because whitney's invention made cotton harvesting easier, it allowed farmers in the south to increase production." "because of the increase in production, the farmers in south became even more dependent on cotton for revenue."