The answer is option C (the sentence contains a typo).
Explanation:
The typo in the sentence provided is "it it" instead of "it is".
Typo is the shortened of typographical error which is not other than a spelling mistake or a misprint.
In the printing press, typos produce a negative impact, especially if they are placed in the title of a publication. In general, when readers come across typos, they tend to think that editors did not dedicate enough time proofreading the text before publishing.
The more typos a text have, the less reliable it becomes.
