Jawaban:

A. Because

Penjelasan:

The correct answer is "because". The sentence implies that the reason for the late arrival was the heavy traffic. "Because" is used to indicate a cause-and-effect relationship.

The other options have different meanings:

"Because of" is a preposition and usually followed by a noun or noun phrase, but not a clause. Example: "We were late because of the traffic."

• "Due to" is also a preposition that is often used to indicate a cause-and-effect relationship. Example: "The delay was due to the heavy snowfall." • "Thanks to" is used to express gratitude or appreciation, and not suitable in this context. Example: "Thanks to your help, we were able to finish the project on time."

• "Therefore" is an adverb used to indicate a conclusion or result. Example: "We were late; therefore, we missed the opening ceremony."