In the following question, one part of the sentence is being bold. Below are given options suggesting replacements to the bold part, which may improve the sentence. Choose the grammatically correct option. If the sentence is correct as it is, mark 'no correction required' as your answer Elon Musk immediately went on to clarify that he doesn't think that first trip will necessaringly include humans, but that he does believe we could have boots on the lunar surface well before 2024.

(d) In the given sentence, 'necessaringly' in the highlighted part of the sentence, is not correct. The phrase in option a) 'will be humans' is incomplete. Thus, it is grammatically incorrect. In option b) the modal verb 'will' is not followed by the base form of the verb; instead of 'includes', 'include' should be used; also, in the same phrase 'necessarily' which is an adverb is modifying 'humans', which is a noun (misplaced modifier); the adverb 'necessarily' is misplaced here. So, option b) is incorrect. In option c) 'will necessary include humans', use of 'necessary' is incorrect. It should be replaced by 'necessarily' which means as a necessary result; inevitably. Hence, the answer is option d) 'will necessarily include humans.'