单选题：以下哪一项是正确使用r模式打开users.txt文件？

以下哪一项是正确使用r模式打开users.txt文件？
@[C](2)

A. infile = open('r', users.txt)
B. infile = read('users.txt', 'r')
C. infile = open('users.txt', 'r')
D. infile = readlines('users.txt', r)



A.infile = open('r', users.txt)
B.infile = read('users.txt', 'r')
C.infile = open('users.txt', 'r')
D.infile = readlines('users.txt', r)


答案：C