单项选择题

A.绑扎下柱钢筋→绑扎上柱钢筋→绑扎牛腿钢筋
B.绑扎上柱钢筋→绑扎下柱钢筋→绑扎牛腿钢筋
C.绑扎下柱钢筋→绑扎牛腿钢筋→绑扎上柱钢筋
D.绑扎上柱钢筋→绑扎牛腿钢筋→绑扎下柱钢筋