Which one of the following sentences is a comma splice? <br/><br/>a. While the lawyer prepared the case, her assistant checked the report she found no mistakes. <br/><br/>b. Because all the members were early, the meeting got underway ahead of schedule. <br/><br/>c. Dr. Matheson, speaking as head of the hospital's medical council. <br/><br/>d. The secretary handed the report to the supervisor, he read it quickly.