以下生成一个红色图像的是:
A. img = np.zeros((300,300,3), dtype = "uint8") img[:,:,2] = 255
B. img = np.zeros((300,300,3), dtype = "uint8") img[:,:,1] = 255
C. img = np.zeros((300,300,3), dtype = "uint8") img[:,:,0] = 255
D. img = np.zeros((300,300,3), dtype = "uint8") img[:,:,2] = 1