C is the answer.
if we negate C, then it demolishes the conclusion.
C states that, The frequency of invalid warnings will not cause pilots routinely to disregard the system’s warnings.
on negation, it becomes,The frequency of invalid warnings will cause pilots routinely to disregard the system’s warnings
if pilots disregard the system's warnings, then there could be collision or safety issue, hence it demolishes the conclusion.
if we negate C, then it demolishes the conclusion.
C states that, The frequency of invalid warnings will not cause pilots routinely to disregard the system’s warnings.
on negation, it becomes,The frequency of invalid warnings will cause pilots routinely to disregard the system’s warnings
if pilots disregard the system's warnings, then there could be collision or safety issue, hence it demolishes the conclusion.
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