Select the correct answer.

Which detail best shows that Edward was making a good profit?

A. "he squeezed half a dozen lemons into each pail of water, added some sugar, tripled his charge" (paragraph13)

B. "he [spent the rest of the day] refreshing tired mothers and thirsty children on the Coney Island cars." (paragraph 12)

C. "one Saturday the young ice-water boy found that he had a competitor, then two and soon three." (paragraph 13)

D. "then proceeded to sell his water, cooled with ice, at a cent a glass to the passengers." (paragraph 12)