Choose the sentence A, B, C or D that best combines the given sentences. Question 25: We shouldn’t swim in this lake. Water is highly polluted. A: We shouldn’t swim in this lake because water is highly polluted. B: We should swim in this lake because water is highly polluted. C: We shouldn’t swim in this lake so that water is highly polluted. D: We shouldn’t swim in this lake although water is highly polluted.