Question

coordinating conjunctions
b o y f a n s
but or yet for and nor so
i baked a cake for it was your birthday.
i baked a cake, for it was your birthday.
comma no comma

Explanation:

When using the coordinating conjunction "for" (which means "because" in this context) to connect two independent clauses, a comma is typically used before "for" to separate the clauses. In the sentence "I baked a cake, for it was your birthday," the comma before "for" is correct as it properly separates the two independent clauses.

Answer:

comma