4) By using expressions, you will achieve coherence in your paragraph.
varied
transitional
complex
chronological

By using transitional expressions, you will achieve coherence in your paragraph.

Explanation:

Transitional words and expressions are used to link ideas in a sentence, paragraph, or a text. As their name suggests, they help the author transition from one idea to another smoothly, even if the ideas are different or opposite. That helps the flow of ideas and also creates coherence, which is the logical linking of ideas. In other words, when ideas are well-connected, the text has achieved coherence. To do that, we need transitional words.

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself. 

hope this answer you! have a great day.

the italian poet francesco petrarch did! (: