What is the primary function of transitional words and phrases in writing?

Transitional words and phrases serve the primary function of guiding the reader through the text by connecting ideas and signaling relationships between different parts of the writing. They help readers understand how thoughts and arguments are linked, improving the overall flow and coherence of the text. For instance, transitions can indicate addition (e.g., "furthermore"), contrast (e.g., "however"), cause and effect (e.g., "therefore"), and sequence (e.g., "first," "next"). This guiding role is essential for ensuring clarity and enabling the reader to follow the writer's line of reasoning seamlessly.

The other options focus on different aspects of writing but do not capture the primary role of transitional elements as effectively. Options discussing complexity, introduction of new topics, or detailed descriptions do not directly relate to the way transitions function within the structure of the text to facilitate comprehension.