Answer:
D. to link ideas across sentences and paragraphs.
Step-by-step explanation:
In English literature, transition words and phrases helps to make sure that the contents of a literary work are logical and in harmony. Therefore, transition words and phrases are used by writers to connect (join) paragraphs together and create a flow of their ideas and thoughts.
Basically, conjunctions are mainly considered to be transitional words.
Some examples of transition words and phrases are earlier, therefore, however, in summary, but, and, or, conversely, on the contrary, before, likewise, later, because, hence, as a result, consequently, sequel, furthermore, moreover, in the long run, in conclusion, generally, lastly, such as, as an example, for instance, singularly, especially, first of all, accordingly, etc.
Hence, the purpose of transitional words or phrases in an essay is to link ideas across sentences and paragraphs.