Correct answer is : D

s.clear() - removes all elements from the list , so s.index('python3') will raise a ValueError as follows.

>>> s = ['python2' , 'python3', 'java8', 'perl5', 'java9']
>>> s.clear(), s.index('python3')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: 'python3' is not in list
>>>