题目选项分析

Columnist: Metro City has a lower percentage of residents with humanities degrees than any other city of comparable size in our nation. Nationwide, university graduates generally earn more than people who are not university graduates, but those with humanities degrees typically earn less than do graduates with degrees in other disciplines. So the main reason Metro City has higher income per capita than any other city of comparable size in our nation must be its low percentage of residents with humanities degrees.

Which of the following, if true, would most strengthen the columnist's argument?

【选项】In Metro City, a lower proportion of university graduates have humanities degrees than in any other city of comparable size in the nation.