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Which revision correctly combines these two sentences?

There was a lot of traffic today. It took an hour to get home.

A)There was a lot of traffic today it took an hour to get home.
B)There was a lot of traffic today; it took an hour to get home.
C)There was a lot of traffic today and it took an hour to get home.
D)There was a lot of traffic today, it took an hour to get home.