IX. Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
My piano makes unsatisfactory sound. Someone is going to tune it tomorrow.
A.I'm going to have my piano tuned tomorrow due to the unsatisfactory sound it makes.
B.If my piano makes unsatisfactory sound, someone is going to tune it tomorrow.
C.My piano makes unsatisfactory sound, so I am going to tune it tomorrow.
D.The piano which makes unsatisfactory sound is going to be tuned tomorrow.

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