List things that an English teacher could do to improve their class

Which of the following is a complex sentence? a. after henry submitted his essay, he realized that he hadn't proofread the last page. b. identity theft is a growing problem, especially among seniors. c. we didn't have enough potatoes for dinner, so we served rice instead. d. jim tried to watch a video on a device connected to a crowded wireless network; as a result, the video stuttered and froze.

This summer, stretched on well into fall, yielded a rich crop a. which b. itself c. whose d. those

Which type of text structure focuses on what makes something happen and the consequences of that action?