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Hi SKP220292,
Your reading of the argument is spot on. The author does use quality (lost/delayed letters) as the tool to attack the "letters delivered per worker" metric. The slip is in how you're reading the question stem, not the argument.
Read the stem literally
"The objection... is based on doubts about the truth of which statement?" This is asking for a statement that the author believes is false - a statement whose negation is the assumption powering the objection. It is not asking which statement the author doubts the validity/importance of. So the correct choice is something the author thinks is untrue.
Now run that test on D
Statement D says: "The quality of services rendered can appropriately be ignored in computing productivity." Does the author think this is true or false? Clearly false - the author's whole objection is that you cannot ignore quality (lost/delayed letters) when measuring productivity. The author doubts the truth of D. That is exactly what the stem asks for. So picking D does not mean the author doubts quality matters - it means the author doubts the claim that quality can be ignored. That lines up perfectly with your own reading.
Why B fails the same test
B says: "Delivery of letters is the primary activity of the postal service." Does the author doubt this is true? No - the author never disputes that delivering letters is what the postal service is for. The objection isn't "delivery isn't the main job"; it's "counting deliveries alone misses the quality side." So the author has no doubt about the truth of B, which is exactly why B is wrong.
One word to lock it in
Mentally swap "doubts about the truth of" for "treats as false." The author treats D as false and B as true. The answer must be the one treated as false - D.
Answer: D
Your reading of the argument is spot on. The author does use quality (lost/delayed letters) as the tool to attack the "letters delivered per worker" metric. The slip is in how you're reading the question stem, not the argument.
Read the stem literally
"The objection... is based on doubts about the truth of which statement?" This is asking for a statement that the author believes is false - a statement whose negation is the assumption powering the objection. It is not asking which statement the author doubts the validity/importance of. So the correct choice is something the author thinks is untrue.
Now run that test on D
Statement D says: "The quality of services rendered can appropriately be ignored in computing productivity." Does the author think this is true or false? Clearly false - the author's whole objection is that you cannot ignore quality (lost/delayed letters) when measuring productivity. The author doubts the truth of D. That is exactly what the stem asks for. So picking D does not mean the author doubts quality matters - it means the author doubts the claim that quality can be ignored. That lines up perfectly with your own reading.
Why B fails the same test
B says: "Delivery of letters is the primary activity of the postal service." Does the author doubt this is true? No - the author never disputes that delivering letters is what the postal service is for. The objection isn't "delivery isn't the main job"; it's "counting deliveries alone misses the quality side." So the author has no doubt about the truth of B, which is exactly why B is wrong.
One word to lock it in
Mentally swap "doubts about the truth of" for "treats as false." The author treats D as false and B as true. The answer must be the one treated as false - D.
Answer: D
SKP220292
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