Late post. (sigh) seem to be late on everything. anyways you can add one for D.
a Retailers expect this to be one of the busiest shopping seasons yet, drastically increasing the number of people in mall parking lots. This actually strengthens the idea to put more security around the area. NOPE.
b Police reports from the previous year show that most of the robberies occurred in the south parking lot. hmmm. interesting. but i don't think this is the answer. lets look at it this way. prior to teaming with the police, the mall security had 10 individuals. if 2/3 patrolled the north, then 1/3 patrol the south. that means about 7 north and 3 south. now lets assume that we add 10 police to the equation. now we have 20 individuals for patrol. if we do 1/3 in the south, we now have 6 people patrolling. more than the 3 we had last year. this may not be efficient, but it still provides a good enough reason to partner with the police.
c Some officers in the north parking lot will be directing traffic rather than patrolling. The answer, indeed, does say SOME. this still means that there are a number of police on patrol. Again, if you use the logic from B, then it still wouldn't be grounds for any criticism.
d Security cameras have been installed on light posts in all parking lots, in the hopes of identifying armed robbers. ahh here is the answer. if we placed a number of cameras in the parking lot, it could be grounds to say the additional security is pretty much pointless.
e There are a large number of entrances and exits to the parking lots, making isolating suspect cars difficult. this seems more likely to strengthen the argument.