In the given question, a part of the sentence is printed in bold. Below the sentence, three alternatives to the bold part are given, more than one of which may help improve the sentence. Choose the option that reflects the correct use of the phrase in the context of the sentence. In case the given sentence is correct, your answer is option (E), i.e., “No correction required”.

Despite the abuse and insults that were hurled at him, he really sticks on his guns and showed the protesters how to be calm.

I. he really stuck onto his guns and showed the protesters
II. he really stuck to his guns and showed the protesters
III. he really is sticking his guns onto the protesters