1 . According to a survey of business firms in a certain city, 750 firms offer their employees health insurance , 640 offer dental insurance and 280 offer health insurance and dental insurance. How many firms offer their employees health insurance or dental

• A. 920
• B. 1,100
• C. 1,110
• D. 1,030
• D. 1,490

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Answer: Option C

Explanation: