The Developmental Sequence for the Leg Action Component of Skipping

The developmental sequence for the leg action component of skipping is

A) one-footed skip/two-footed skip; flat-footed landing/two-footed skip; ball-of-the-foot landing
B) one-footed skip/two-footed skip; ball-of-the-foot landing/two-footed skip; flat-footed landing
C) two-footed skip; flat-footed landing/one-footed skip/two-footed skip; ball-of-the-foot landing
D) two-footed skip; ball-of-the-foot landing/two-footed skip; flat-footed landing/one-footed skip