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Find the correct form of the sentence.
A. Salmon swim upstream, they leap over huge dams to reach their destination.
B. Salmon swim upstream, and they leap over huge dams to reach their destination.
C. Salmon swim upstream, then they leap over huge dams to reach their destination.
D. Salmon swim upstream, after they leap over huge dams to reach their destination.
What is B. Salmon swim upstream, and they leap over huge dams to reach their destination.