Only one of the following statements is TRUE. Which one?

	A. The piano is known as "The Queen of Instruments."
	B. The total string tension in a concert grand piano is close to 20 tons.
	C. Felt, buckskin, paper, steel, iron, and copper are among the materials used to make various parts of the piano's playing mechanism.
	D. The first practical piano with an escapement mechanism for the hammers and capable of being played softly and loudly was built in Japan in 1887.