Which of the following sentences contains a comma splice?
a. the cruise ship docked on oahu, then again on maui.
b. the pots clanged to the kitchen floor, the kitten cowered under the table.
c. our friend, who travelled from tennessee, was quite tired when he arrived.
d. we need with organization, structure, and spelling

A comma splice occurs when two independent clauses are separated by only a comma. Looking at the sentences, the first one is fine because it is an independent clause followed by a dependent clause. The third sentence is really one independent clause with an appositive to describe the friend. The fourth sentence is just one independent clause. The second sentence though has two independent clauses. You can tell because in the first part of the sentence before the comma, there is a subject and verb; the second part also contains a subject and verb meaning they are not dependent on each other and therefore a comma splice.