基本茶类分为不发酵的绿茶类及( )的黑茶类等，共六大茶类。
The basic tea is divided into non fermented green tea and () black tea, with a total of six categories. A.
重发酵
Heavy fermentation B.
后发酵
post fermentation C.
轻发酵
light fermentation D.
全发酵
full fermentation