Questions: Which of the following sentences demonstrates correct grammar and usage? If any fewer people watch that television series, the effect will be its cancellation. If any less people watch that television series, the effect will be its cancellation. If any fewer people watch that television series, the affect will be its cancellation. If any less people watch that television series, the affect will be its cancellation.

The answer is "If any fewer people watch that television series, the effect will be its cancellation."

This sentence is grammatically correct. "Fewer" is used correctly to refer to a countable noun ("people"), and "effect" is the correct noun form to indicate the result of an action.

This sentence is incorrect because "less" should be used with uncountable nouns, not countable nouns like "people." The correct term here is "fewer."

This sentence is incorrect because "affect" is a verb, and the correct noun form needed here is "effect."

This sentence is incorrect for two reasons: "less" should be "fewer" when referring to countable nouns like "people," and "affect" should be "effect" to correctly use the noun form.