The option that always requires a comma before the conjunction is compound sentence. In a compound sentence, which consists of two independent clauses joined by a conjunction (such as "and," "but," or "or"), a comma is needed before the conjunction to properly separate the clauses.
For example:
- I wanted to go for a walk, but it started raining.
However, it's important to note that while long introductory elements and appositives may often require commas, they do not always require a comma before a conjunction as a compound sentence does. A simple sentence does not involve conjunctions or independent clauses and therefore does not require a comma before a conjunction.
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