Marek accepted the business award his classmates applauded his hard work. A. Marek accepted the business award and his classmates applauded his hard work. B. When Marek accepted the business award, his classmates applauded his hard work. C. Marek accepted the business award, therefore his classmates applauded his hard work. D. Marek accepted the business award, his classmates applauded his hard work.