Which sentence uses correct subject-verb agreement?
The alligators slips quietly into the water.
The alligators slipping quietly into the water.
The alligator slipping quietly into the water.
The alligator slipped quietly into the water.
The alligators slips quietly into the water.
The alligators slipping quietly into the water.
The alligator slipping quietly into the water.
The alligator slipped quietly into the water.