[Multiple-Choice]According to the Diagnostic criteria of pneumoconiosis (GBZ 70-2015), which of following is Phase two
A. Grade 1 small shadow, and distribute 2 lung area
B. Grade 2 small shadow, and distribute >4 lung area
C. Grade 3 small shadow, and distribute 4 lung area
D. Large shadow with long diameter>20mm and short diameter>10mm