The main idea of the passage is: To address the lack of a gender-neutral pronoun that can refer to a person.
The main idea of a text, is the central idea being discussed in the text.
In the text provided above, we find that the issue being discussed is the lack of a gender-neutral pronoun that can be used in addressing people whose gender are not know at the time.
Thus, option B is correct.
Learn more about gender-neutrality here:
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