…… a failure of some traffic lights, traffic is moving very slowly. A. Owing B. Due to C. Because D. Since

The correct answer is: C. Because

• Owing means “as a result of” or “because of.”
• Due to is similar to “owing
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  to,” but it is more formal.
• Since means “from a particular time in the
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  past until now.”

In the sentence “Because of a failure of some traffic lights, traffic is moving very slowly,” the word “because” is used to introduce the reason why traffic is moving slowly. The other options are not as appropriate in this context.