IX. Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
I find it very challenging. It requires a lot of concentration and determination.
A.I find it very challenging, so it requires a lot of concentration and determination.
B.I find it very challenging, yet it requires a lot of concentration and determination.
C.I find it very challenging, for it requires a lot of concentration and determination.
D.I find it very challenging, though it requires a lot of concentration and determination.

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