(ENGLISH) HELP ASAP

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

A.
"he [spent the rest of the day] refreshing tired mothers and thirsty children on the Coney Island cars." (paragraph 12)
B.
"he squeezed half a dozen lemons into each pail of water, added some sugar, tripled his charge" (paragraph 13)
C.
"then proceeded to sell his water, cooled with ice, at a cent a glass to the passengers." (paragraph 12)
D.
"one Saturday the young ice-water boy found that he had a competitor; then two and soon three." (paragraph 13)

ONLY CHOOSE ONE