Waterfalls in Yosemite National Park plunge over tall cliffs and merge with the waters below. What is the verb of this sentence?

Which sentence is an example of objective, third-person writing that could be found in a scientific essay? a. i was 15 years old when i developed an eating disorder. b. my sister developed an eating disorder when she was a teenager. c. eating disorders often appear during the teen years. d. you are most likely to develop eating disorders during your teenage years.