The correct revision for the sentence is: C. If a diver gets "the bends," he or she will have to be hospitalized.
The correction made in option OC involves capitalizing the first letter of "diver" and using lowercase for "the bends" to adhere to standard grammatical conventions.
In English, common nouns like "diver" are typically written in lowercase, while specific medical conditions like "the bends" aren't capitalized unless they begin a sentence or title. This revision ensures proper grammar and style in the sentence.