The audience for a particular piece of writing is a professor. The purpose of the text is to show knowledge about a major cause of World War II.

What form of writing and what kind of supporting details best support this audience and purpose?

essay; details support the main idea

e-mail; details support the main idea

e-mail; details of dates and places

It would be most appropriate to choose an essay format with supporting details that thoroughly explain and demonstrate knowledge of the major cause of World War II. The professor would likely appreciate a well-organized essay that provides historical context, analysis, and evidence to support the main point. Details such as specific events, key figures, and significant factors leading up to the outbreak of the war would be crucial in conveying the depth of understanding on the topic. This format would allow for a comprehensive exploration of the major causative factors of World War II and provide the professor with a clear demonstration of the writer's knowledge and expertise on the subject.