Final answer:
Nouns ending with 'o' are generally gender-neutral in English.
Step-by-step explanation:
Nouns ending with 'o' can be of different genders depending on the language. In English, the gender of a noun is not determined by its ending. English nouns are generally considered gender-neutral unless they specifically refer to male or female entities. For example, 'hero' and 'piano' are gender-neutral nouns that end with 'o'. So, the correct answer would be C. Nouns that end with 'o' are gender neutral.
Learn more about Gender of nouns ending with 'o' in English