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AndrewEspi

Answer: The driver was wondering whose suitcase that was.

Explanation: Who's stands for who is, so if we used who's it would be: The driver was wondering (who is) suitcase that was.

Therefore, the answer is whose...I hope this helps!

Answer:

whose would be the correct answer, ...who's is the possesive form for "who is", which would be incorrect if inserted in the sentence  

Explanation: