Gerald, Robert, and Shirley were the only people who registered for a beginner's golf lesson this morning. None of the people sitting in the clubhouse this morning at ten o'clock had ever played golf. Neither Gerald nor Shirley is an accomplished golfer. Everyone sitting in the clubhouse this morning at ten o'clock registered only for a beginner's golf lesson.
Everyone sitting in the clubhouse of the golf course today at ten o' clock had just registered for a beginner' s golf lesson. Gerald, Robert, and Shirley were sitting in the clubhouse this morning at ten o' clock. No accomplished golfer would register for a beginner' s golf lesson.
If the statements above are true, which one of the following must also be true on the basis of them?