IX. Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
People use pesticides and fertilizers. They want to increase crop production.
A.People want to increase crop production, so they use pesticides and fertilizers.
B.Unless people want to increase crop production, they use pesticides and fertilizers.
C.People want to increase crop production because they use pesticides and fertilizers.
D.People want to increase crop production, for they use pesticides and fertilizers.

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