The following sentence contains a comma splice:
Driven by instinct, the salmon rushed upstream, the salmon neither knew nor cared about the hungry bears that awaited them.
Which revision corrects the sentence?
Driven by instinct, the salmon rushed upstream; They neither knew nor cared about the hungry bears that awaited them.
Driven by instinct, the salmon rushed upstream, they neither knew nor cared about the hungry bears that awaited them.
Driven by instinct, the salmon rushed upstream and neither knew nor cared about the hungry bears that awaited them.
Driven by instinct, the salmon rushed upstream. Neither knew nor cared about the hungry bears that awaited them.