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When a worker bee reaches the age of three weeks; therefore, it begins one of its primary functions—hunting for food.
Which is the best way to rewrite the sentence to form a complex sentence?
A. By a worker bee reaching the age of three weeks, it begins one of its primary functions—hunting for food.
B. A worker bee reaches the age of three weeks, so it begins one of its primary functions— hunting for food.
C. When a worker bee reaches the age of three weeks, it begins one of its primary functions—hunting for food.
D. A worker bee reaches the age of three weeks, but it begins one of its primary functions— hunting for food.
What is C. When a worker bee reaches the age of three weeks, it begins one of its primary functions—hunting for food.