Option C:
If an accurate* detector was invented in 2012, then the number of alarms should have INCREASED (not decreased) in 2012. However the passage states that the number of smog alerts in Los Bernardinos dropped to 118. Thus invention of detector DOES NOT EXPLAIN the trend seen during the period. Hence Option C is the correct answer.
(*N.B.: Technically, the wording should have been "more sensitive", not "more accurate".Sensitivity of an instrument causes more number of
...
If an accurate* detector was invented in 2012, then the number of alarms should have INCREASED (not decreased) in 2012. However the passage states that the number of smog alerts in Los Bernardinos dropped to 118. Thus invention of detector DOES NOT EXPLAIN the trend seen during the period. Hence Option C is the correct answer.
(*N.B.: Technically, the wording should have been "more sensitive", not "more accurate".Sensitivity of an instrument causes more number of
...
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