To calculate the points Charles earned, we will use the given scoring system: 2 points for each second underwater and 1 point for each meter swum.
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Points for staying underwater:
- Charles stayed underwater for 68.4 seconds.
- Points = 68.4 seconds × 2 points/second = 136.8 points.
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Points for swimming distance:
- Charles swam 60.2 meters.
- Points = 60.2 meters × 1 point/meter = 60.2 points.
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Total points earned:
- Total points = Points for underwater time + Points for distance swum
- Total points = 136.8 points + 60.2 points = 197.0 points.
Therefore, the total points Charles earned is 197.0. The correct answer is b. 197.0.