The correct answer is 2. Connect ideas in the paragraph together
Explanation:
In writing, transition words and phrases refer to a word or set of words used to establish a connection between words, clauses, sentences and even paragraph in a text, this includes words and phrases such as however, on the other hand, additionally, to begin with, or to sum up that establish different relations between ideas and guide the reader to understand the way ideas are connected. At the paragraph level, transition words are necessary because they connect the ideas including the topic sentence, supporting details and concluding sentence that serves to support the main idea in a text. Therefore, transition words and phrases in a paragraph mainly connect ideas in a paragraph together.