ব্যাখ্যা
The correct answer is (b) To connect.
Definition: A Conjunction is a Part of Speech that joins (connects) words, phrases, or clauses together.
Types of Conjunctions:
1. Coordinating Conjunctions: join equal grammatical units — for, and, nor, but, or, yet, so (FANBOYS)
Example: He is poor but honest.
2. Subordinating Conjunctions: join a dependent clause to a main clause — because, although, when, if, since, unless
Example: He failed because he didn't study.
3. Correlative Conjunctions: work in pairs — either...or, neither...nor, both...and, not only...but also.
The primary purpose of a conjunction is always to CONNECT different parts of a sentence.
Source: Wren & Martin – High School English Grammar; A Practical English Grammar.