Identify 4 essential actions to completing a pirouette turn and why that action is needed to complete the turns

Starting in first position, then going into fifth with piled legs, adding a small bounce when starting, and spotting.  First position is where one should start most actions.  Fifth position allows one to get into the position for the pirouette.  The bounce helps to create energy for the turn.  Spotting allows one to keep turning without getting dizzy and falling.  

all of them except "c"

i think this is true