Surely, he thought, I can't trust this enticing yet dubious offer, although I could use the opportunity more than I'd like to admit. Which of the following parts of speech is the word "although"?
A. Participle
B. Conjunction
C. Adverb
D. Interjection
Although means 'in spite of something'. it is a subordinating conjunctions. This means that the clause which they introduce is a subordinate clause, which needs a main clause to make it complete
Therefore, the Correct Answer is B.