Based on the bar chart, the two categories that would fall under the 6 - 7 minutes required timeframe are 6 - 6.4 and 6.5 - 6.9. The bar for 6 - 6.4 says there were 25 people who ran within that timeframe, while that for 6.5 - 6.9 says there were 15 people under that. This adds up to a total of 25 + 15 = 40 people, which is choice C.
