Answer:
B. Chong-ak (Also known as Jeongak)
Explanation:
Jeongak or Chongak means literally "right (or proper) music", and its tradition includes both instrumental and vocal music, which were cultivated mainly by the upper-class literati of the Joseon society. The instrumental branch has several versions of a lengthy chamber, chiefly Yongsan hoesang, while the vocal branch sometimes includes the meaning of Jeongga (Right Song) with a wide range of Gagok, Gasa, and Sijo.
(proper and correct share the same meaning; just in case you'll get confused)
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