单项选择题

A.HPB300级钢筋冷拉伸长率不宜大于4%
B.HRB335级钢筋冷拉伸长率不宜大于3%
C.HRB400级钢筋冷拉伸长率不宜大于2%
D.RRB400级钢筋冷拉伸长率不宜大于2%