SAT Question 47547d07: Transitions answer and explanation

English - Transitions - Sequence Transition
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In June, female loggerhead sea turtles will swim back to the sandy beaches where they were born to lay eggs of their own. First, the turtle will dig her nest in the sand. ______ she will lay up to 100 eggs in the nest. Finally, she will cover it all with sand, before returning to the ocean.
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Difficulty:Easy
Which choice completes the text with the most logical transition?