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Which of the following most logically completes the argument?
Every business searches for the quickest service, at the lowest price, with the best results. The Internet has allowed companies to hire the services of professionals anywhere in the world. Thus, the costs of IT services are likely to drop since __________.
This answer choice cannot support the prediction about the drop in IT services costs and therefore is not the most logical completion of the argument. The fact that companies have less to spend on external services cannot be assumed to be a factor that will affect the cost of such services. Prices may go up even though budgets are low, making IT services less common.
This answer choice neither strengthens nor weakens the conclusion and therefore cannot logically complete the argument. It can only support the conclusion if we assume that less experienced professionals charge lower fees, but that may not be the case.
This answer choice weakens the conclusion and therefore cannot logically complete the argument. A language barrier would reduce the amount of business being done over the internet, an idea which undermines the argument's position as a whole and does not explain why costs should drop.
This answer choice neither strengthens nor weakens the conclusion and therefore cannot logically complete the argument. Too many assumptions have to be made to prove that a decrease in the price of consumer products will lead to the decrease in the cost of IT services.
This answer choice strengthens the conclusion by explaining a cause for a decrease in services costs and therefor logically completes the argument. The more available professionals there are, the greater the competition; the greater the competition, the lower the prices and costs are.