I believe the correct is the third option. It is important to preview sources before using them in your research because it reveals deeper concepts. Reading deeply the sources would allow you to have a deeper understanding of the sources and determine which parts of the sources are useful to your research.
The sentence that is punctuated correctly is, We need to add these ingredients: baking soda, brown sugar, and salt. The correct answer is option D. The punctuation mark, colon (:) is used to introduce a series of items. But, there is a rule to be considered when to use a colon. Never use a colon if a verb or a preposition follows it. In the correct sentence, the word that precedes the colon is a noun, which makes the sentence correctly punctuated.
