In the seventeenth century the organ, the clavichord, and the harpsichord became the chief instruments of the keyboard group, a supremacy they maintained until the piano supplanted them at the end of the eighteenth century.
The words "a supremacy" in line 9 are closest in meaning to
(A) a suggestion
(B) an improvement
(C) a dominance
(D) a development
正确答案：C