Rank each drug according to its ability to increase myocardial O2 demand: (potent -> least potent)
Scopolamine
Robinul
Atropine
a) Atropine > Robinul > Scopolamine
b) Scopolamine > Robinul > Atropine
c) Atropine > Scopolamine > Robinul
d) Robinul > Atropine > Scopolamine