Correcting Punctuation Errors: Commas in Lists Practice Test

The issues to be discussed in the debate will be economics foreign policy and health care

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English. One of the answer choices reproduces the underlined portion as it is written in the sentence.

Much of the time, only the most discerning animal trainer cannot tell the difference between thoroughbreds Arabians and saddlebred horses.