运行以下Python代码，绘制出来的第六个柱形图颜色是？（ ）
import matplotlib.pyplot as p import numpy as np x=np.array(['a','b','c','d','e','f']) h=np.array([1,4,5,6,4,3]) c=np.array(['red','blue','green']) p.bar(x=x,height=h,color=c) p.show()
red
blue
green
black
