Select the most appropriate option to fill in the blank.History is not only a very vast subject ________ very

Complete Sentence:

History is not only a very vast subject but also very intriguing.

Explanation:

This sentence follows the correlative conjunction pair:

Not only … but also

This structure is used to connect two similar ideas and emphasize that both are true.

Pattern:
Not only + first idea + but also + second idea

Here:

• not only → a very vast subject
• but also → very intriguing

So the sentence means: History is both vast and interesting.

Why other options are incorrect?

❌ and → breaks the fixed pair "not only...but also"
❌ besides → means "in addition to" and doesn't fit the structure
❌ also → incomplete without but

Extra Facts:

📘 Common Correlative Conjunctions:

• Either ... or → Either tea or coffee
• Neither ... nor → Neither Ram nor Shyam
• Both ... and → Both reading and writing
• Not only ... but also → Not only smart but also hardworking

Example:
She is not only intelligent but also kind.