A. after the beginning of the Christian Era
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d)all of these are needed items
All of these are important you need to author's name to quote them, you need the title so readers know what you are researching, and dates of publication, so they know around the time this was published.
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Spelling can impact the overall effect of a piece of writing because it effects the formality of the writings. If many words are spelled incorrectly it makes the writing hard to read.
C - Dana should ask, “What was the effect of Pandora’s box upon Greek culture?” using an encyclopedia entry for research