Answer:
One Piano
Explanation:
The instrumentation of the "At the river" character piece is one piano.
The movement of the notes conveys the movement of a flowing river
In character piece, piano are relatively used for brief musical composition to express mood and idea and they are always used to channel a single mood or impression
The passage describes the Author's impression of students participating in the "Upward Bound" program and it is generally favourable towards the program, without giving a more specific reason for this favourable opinion, it's more the author's personal impression.
Thus, we could say that the author has a positive bias towards the program.
