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.

Look at the underlined section marked (16). Choose the answer that best corrects this sentence, if appropriate.
Responses
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.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.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.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.

D Correct as is.

The correct answer is 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."

The correct answer is B:

"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."

This answer is the best correction because it properly includes the word "because" at the beginning of the sentence to indicate cause and effect relationship. Additionally, it maintains the correct sentence structure and does not introduce any grammatical errors.