An accomplished cellist's memories of how to play a Bach sonata on the cello are

What is the appropriate developmental sequence for running of the following descriptions of leg action?

I. The swing thigh moves forward with acceleration causing 90 degrees of maximal flexion in the knee. II. The run is flat-footed, with minimal flight. III. Foot contact is with the heel or the ball of the foot. A. I, II, III B. II, I, III C. III, II, I D. III, I, II E. II, III, I

One function of the _______________ is to prevent signals in adjacent cells from interfering with each other

a. cell body b. myelin sheath c. dendrites d. axon