Official Solution:
A city government plans to remove the free parking spaces in downtown areas to encourage the use of public transportation. If this change is implemented, drivers who currently park downtown for free would have to pay for parking. Consequently, many downtown businesses are concerned that their customer traffic would decrease significantly, leading to reduced sales.
The argument above assumes which of the following?
A. Other incentives or conveniences are insufficient to keep the same number of customers visiting downtown businesses.
B. Downtown businesses depend solely on customers who drive and park downtown for the majority of their sales.
C. The primary reason for removing free parking is to generate additional revenue from paid parking spaces.
D. Customers who currently use the free parking are likely to visit downtown businesses less often if they have to pay for parking.
E. The city should provide additional public transportation options to compensate for the removal of free parking spaces.
(A) Incorrect. We do not know about other incentives or what this statement refers to. Other incentives may or may not be insufficient to keep the same number of people visiting. However, this statement is irrelevant and outside of the scope. Eliminate.
(B) Incorrect. This answer suggests that all revenue for downtown businesses comes from drivers, but this statement tells us nothing about the likelihood of drivers driving if they have to pay for parking. Without this additional detail, we can deny this assumption, and the argument would still stand. This is a partial assumption only. In contrast, the correct answer/assumption would say that downtown businesses depend solely on the customers who drive and those customers will not be driving if they have to pay for parking because if the businesses depend on customers who drive and those customers continue driving, then there is no problem. Also, it is likely too extreme of an assumption/statement as people traveling by bus or foot may also be shopping.
(C) Incorrect. Knowing the reason for the parking fee is not relevant to the concerns of the downtown businesses. Irrelevant. Eliminate.
(D) Correct Answer: This is the correct assumption because the argument depends on the behavior change of customers who would have to start paying for parking; if this change doesn't reduce their visits, the businesses wouldn't necessarily see reduced traffic. This passes the negation test as the assumption the argument depends on. Notice in contrast to (B), this answer choice addresses both aspects: 1) many customers are drivers and 2) Customers/drivers are less likely to visit if they have to pay for parking.
(E) Incorrect. This answer choice introduces a potential solution rather than an assumption and thus is an incorrect assumption/answer. Eliminate.
Answer: D