Look at the underlined section marked (16). Choose the answer that best corrects this sentence, if appropriate. A) Because veterinary care usually is done at the zoo in a special health care building that has the special equipment needed to fill cavities in a tiger's teeth or perform surgery on a lion. B) Veterinary care usually is done at the zoo in a special health care building that has the special equipment needed to fill cavities in a tiger's teeth or perform surgery on a lion. C) Veterinary care usually done at the zoo in a special health care building that has the special equipment needed to fill cavities in a tiger's teeth or perform surgery on a lion. D) Correct as is. correct answer