Which revision best reduces the wordiness in this sentence without changing its overall meaning? marine algae, the ocean plant life that generate more oxygen than all of earth's plants and trees combined, produce up to 80 percent of earth's oxygen. a. marine algae, the ocean plant life that generate more oxygen than all the plants and trees that participate in photosynthesis, produce up to 80 percent of earth's oxygen. b. marine algae produce up to 80 percent of earth's oxygen. c. marine algae produce up to 80 percent of earth's oxygen — more than all of earth's plants and trees combined. d. marine algae produce 80 percent of earth's oxygen, the ocean plant life that generates more oxygen than all of earth's plants and trees combined.

C. Marine algae produce up to 80 percent of Earth's oxygen - more than all of Earth's plants and trees combined.

The original sentence is communicating two facts algae produce 80 percent of oxygen and that is more than all the other vegetation on land. The original sentence is repetitive when it says generate and produce, as these both mean to make. The second source of repetition is the use of "the ocean plant life" after "Marine algae". The use of the adjective Marine tells the reader that the algae is in the ocean. In order to reduce the wordiness of the sentence, it is necessary to remove one of each of these items of repetition. Options A and D do not do this. In fact, Option A adds more wordiness. Since all plants participate in photosynthesis, this is an unnecessary addition. Option B eliminates the repetitive elements, but it also eliminates one of the facts that the sentence was intending to communicate. Option C is the only one that eliminates the repetition without eliminating the key information.