Read this sentence from the passage.

While those riders in Denver, Colorado, were busy reducing carbon emissions, they burned a combined 3.4 million calories.
Which statement best explains the author's purpose for including the sentence in the passage?
Answer choices for the above question

The sentence introduces the idea that bike sharing improves riders' health.

The sentence explains how human health concerns compete against environmental interests.

The sentence provides evidence of how bike sharing helps the environment and has positive effects on riders.

The sentence reveals that the health benefits of bike sharing are more significant than the environmental benefits.