Which of the following sentences contains two independent clauses?

In the context of identifying sentences that contain two independent clauses, the correct answer highlights the construction of compound sentences. The sentence "I rushed to the store, but arrived too late" features two independent clauses: "I rushed to the store" and "arrived too late." Each of these clauses has its own subject and verb, making them complete sentences on their own. The conjunction "but" serves to connect them, indicating a contrast between the two actions.

This clarity in combining two independent thoughts is a hallmark of effective sentence structure, emphasizing the relationship between the two actions. The presence of a conjunction plus a comma is a typical construction for such combinations, helping to convey a more complex idea clearly and effectively.

The other options either contain dependent clauses or are single independent clauses, which do not meet the criteria for containing two independent clauses.