When he was a small boy living with his brother, Bach was forbidden to
touch his brother’s expensive handwritten music book, which was kept in a
music cabinet with barred doors. Bach
slid the book between the bars of the cabinet and copied the music from the
forbidden book into his own book.
The correct answer is C. Best
Best is the correct answer because that is the correct superlative form of the adjective "good". Here we use the superlative to show that he was the best of all the students.
Roget's international Thesaurus
I think it's clarity, the story has to be clear so that the readers understand.
