Transitions provide connections from one sentence to the next or from one paragraph to the next. Option D is correct.
When you state the main ideas and key details of an article in your own words, you are summarizing the information. Option B is correct.
A transition is a word or phrase that connects one idea to another. This connection can be found within a paragraph or between paragraphs. Transitions are employed in an attempt to show how sentences or paragraphs are related to each other and how they relate to the overall theme of the text.
A summary is a rretelling of a text by a reader's own words that provides the main points of a piece of writing such as a newspaper article, the chapter of a book, or even a whole book.