9.下列选项中，程序运行的效果为圆环图的是（）
选项：

A:

import numpy as np

import matplotlib.pyplot as plt

data = np.array(20, 50, 10, 15, 30, 55])

pie_labels = np.array('A', 'B', 'C', 'D', 'E', 'F'])

plt.pie(data, labels=pie_labels)

plt.show()

B:

import numpy as np

import matplotlib.pyplot as plt

data = np.array(20, 50, 10, 15, 30, 55])

pie_labels = np.array('A', 'B', 'C', 'D', 'E', 'F'])

plt.pie(data, radius=1.5, labels=pie_labels)

plt.show()

C:

import numpy as np

import matplotlib.pyplot as plt

data = np.array(20, 50, 10, 15, 30, 55])

pie_labels = np.array('A', 'B', 'C', 'D', 'E', 'F'])

plt.pie(data, radius=1.5, explode=0, 0.2, 0, 0, 0, 0],labels=pie_labels)

plt.show()

D:

import numpy as np

import matplotlib.pyplot as plt

data = np.array(20, 50, 10, 15, 30, 55])

pie_labels = np.array('A', 'B', 'C', 'D', 'E', 'F'])

plt.pie(data, radius=1.5, wedgeprops={'width': 0.6},labels=pie_labels)

plt.show()