Let’s examine the sentence: “You ____ the car carelessly because it is still very dirty.” The sentence consists of two clauses joined by the conjunction, ‘because.’ The use of ‘carelessly’ suggests that the work has been done but not perfectly and the use of ‘dirty’ suggests that the desired result has not been achieved. As the work has a;ready been done, Options A and D are ruled out because they suggest that the work has not been done. The second clause suggests that the work has been completed and the result is that the car is ‘still very dirty.’ This rules out Option B as it suggests that work is yet to be done. Option C is the correct answer as it conveys the intended meaning that the work has been completed.