Which sentence uses an objective tone?
we will plant the best garden of any school in the area.
the new campus garden will surely be envied by other schools.
a garden would provide numerous benefits to the students.
you will probably agree that gardens have many benefits.

Objective tone is used to provide unbiased, neutral, factual information. Therefore, items written using an objective tone are often impersonal and do not include any opinion or information whatsoever about the writer. Within this list, the sentence that meets with all these requirements and uses an objective tone is: a garden would provide numerous benefits to the students.

Objective tone refers to a style of writing which is impersonal. An objective tone doesn't include the information about the author but about something. For instance,

The dish took 15 minutes to cook.

It is an objective tone

Whereas, a sentence such as:

I took 15 Minutes to cook the dish.

It is a subjective tone as it includes 'I.'

Therefore, sentence which uses an objective tone is:

A garden would provide numerous benefits to the students.

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serve the people! ,” smoothly translated by julia lovell, offers an initial sample of yan lianke’s writing to an english-speaking audience. a bluntly drawn, mildly erotic fable, it teases mao zedong by poking fun at a true believer who obeys the chairman’s precepts too literally. to a western sensibility, the broad strokes of yan lianke’s humor would seem to pose little risk of inciting rebellion, whether of the flesh or of the body politic. but then, part of the book’s attraction is that it doesn’t have a western sensibility. it lets the reader see — or rather, intuit — what jokes chinese officials don’t consider funny, and how very little it takes for a writer to be branded an incendiary in 21st-century china, more than three decades after the death of mao, a decade after the death of deng xiaoping and seven years since china entered the world trade organization, a move that would seem to signal a willingness (however wary) to mingle with the rest of the world.