This passage is mainly about                   ...

Câu hỏi: This passage is mainly about                                           .

A efforts to organize watercolor painters in New York City during the mid-1800's.

B styles of watercolor painting in New York City during the mid-1800's.

C the most influential watercolor painters in the mid-1800's.

D a famous exhibition of watercolor paintings in New York City in the mid-1800's.