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The plan to build a new merchant quarter in the city of Istanbul will surely contribute towards reestablishing the city as the central trading hub it used to be in the past. Though a certain part of the ancient wall will have to be removed as part of the project, the project will, if it meets the analysts' predictions, raise the GNP (Gross National Product) by over 10% over the first four years following its completion. The past cannot be allowed to hold back the future.
In the argument, the two portions in boldface play which of the following roles?
This answer choice tries to distract you by describing the first boldface as a prediction. Even though the first boldface uses the future tense (will have to be removed), it is incorrect to define it as a prediction.
The argument describes the need to remove a part of the old city wall as a fact (i.e as something certain rather than uncertain). Since the removal of part of the wall is a given - a required condition for carrying out the project - it cannot be defined as a prediction. You can immediately eliminate answer choices that incorrectly define the first boldface part; do not waste time reading the rest.
Another reason to eliminate this answer choice is that the incorrectly defines the second boldface portion as evidence of the prediction that part of the wall will have to be removed. The second boldface's statement about the past not holding back the future is not evidence of anything - it is the argument's conclusion and bottom line.
The author's position can be identified in the conclusion: The past cannot be allowed to hold back the future. In other words: the ancient wall should be removed.
The first boldface is a consideration against this position because it describes the removal of the wall as a drawback: Though a certain part, etc. Nobody is eager to see an ancient monumental relic of archeological importance torn down. This is why this statement weighs against the proposal to tear down the wall.
While this answer choice defines the first boldface part correctly, it defines the second incorrectly. The second boldfaced portion is a position or a recommendation; it is not hard evidence.
An inference is a conclusion based upon premises, whereas the need to remove of the wall for the project is factual - a premise in itself. You can immediately eliminate answer choices that incorrectly define the first boldface part; do not waste time reading the rest.
While this answer choice defines the first boldface part correctly, it defines the second incorrectly. The second boldfaced portion does not discuss the future and therefore is not a prediction; it is a position or a recommendation which relies on the predictions in the argument.