If my_dict is a dictionary as defined below, then which of the following statements will raise an exception?
my_dict = {'apple': 10, 'banana': 20, 'orange': 30}
(A) my_dict.get('orange')
(B) print(my_dict['apple', 'banana'])
(C) my_dict['apple']=20
(D) print(str(my_dict))