Helena has brought an assortment of shoes to try out on the stick-shift car pedal simulator. She begins by working the pedals in a pair of high-heeled pumps, then a pair of flat T-strap sandals, a pair of strappy high heeled sandals, a pair of medium-height wedge-heeled sandals, and a pair of flat thong sandals. Which one lets her toes flex the most? Which will she prefer for driving?