A group of veterinarians at a major veterinary hospital was interested in investigating a possible link between enteroliths, stones that form in the colon of horses, and diet. They decided to conduct a survey of feeding practices of horses in the hospital's state. They created a survey questionnaire and decided to administer it to the owners of every fifth horse being treated at the hospital. The population of interest is:       A)all horses in the state.     b) all horses that are diagnosed with enteroliths.   C) None of the answer choices is correct.   D)all horses brought to the clinic.

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