Scarlet has brought an assortment of shoes to the laboratory to see which ones maximize her comfort and control of the pedals of a stick-shift car. Maria begins by working each of the pedals in a pair of jelly thong sandals, followed by a pair of strappy sandals with a low wedge heel, a pair of synthetic leather flat thong sandals, a pair of high-heeled dress thong sandals, and finally, a pair of strappy flat sandals. Which will let her toes flex the most?