Answer and explanation

Correct answer: B. because of

  1. Step 1: 'Because of' is followed by a noun phrase.
Answer
because of.
Why not the others: "so that" is wrong because 'so that' needs a clause and expresses purpose. "because" is wrong because 'because' needs a clause, not a noun phrase. "although" is wrong because 'although' needs a clause and gives contrast.

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