More monthly Mass Transit Metrocards are sold in the City X than are sold in City Y. It follows that City X citizens spend more time travelling by mass transit on a per capita basis than do City Y citizens.
All of the following, if true, weaken the argument except.
Given: more cards are sold in city X than are sold in city Y
City X citizen spend more time traveling by mass transit than city Y citizen
If new information suggests that citizen in X spend more time traveling by MT is the reason for more cards sold in country X then this new information doesn't weaken the argument.
A. City Y has smaller population than City X.
B. Most City Y citizens work in City X and purchase City X metrocards.
C. The number of working commuters as a percentage of the overall population is higher in City Y than in City X.(weakner)
D. Most City X citizens use the mass transit system primarily during the work week only.(weakener)
E. The price of a City X Metrocard is 20% lower than a City Y Metrocard.(strengthner)
I will go with Choice E
Thanks
akash