Ok, on weaken questions the correct answer does NOT weaken a premise, right?
From PT30, 4, 24
The conclusion is that since voice mail is more (1) flexible (2) convenient (3) cheaper -> answering machines will become obsolete.
The correct answer choice is D. Answering machines have a feature that voice mail does not.
But does D not attack the a premise and D seems to attack the premise that voice mail is more convenient and flexible?
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Hope this helps! Good Luck!