I believe the correct answer from the choices listed above is the first option. A collective subject is a noun (functioning as the subject) that describes a group made of many parts. Examples are brood of chickens, drove of cattle, gaggle of geese, nest of bees, swarm of hornets and herd of buffalo.
The closest answer to that is you'll be able to write more lively sentences. by increasing your vocabulary, you can mix and match different and more beautiful words to help make your writings more colorful. Knowing more words means you have more arsenal for your writing