The bolded part of the embedded part of the quote is called the introduction phrase. So, the correct option is C.
The bolded part of the embedded quote is called the "introduction phrase." In this case, the introduction phrase is "Jane Smith points out, in her article about the sun, that." It provides context and attribution to the quotation, indicating who is making the statement and where it can be found.
Regarding the creation of a block quote, it is typically used for longer quotations that are four lines or more in length. In most style guides, block quotes are formatted by indenting the entire quote from the left margin, and quotation marks are often omitted. Additionally, the citation or attribution is usually placed after the block quote.