As CAn BE sEEn From thE CompArison oF thEsE FigurEs, thE prinCiplE involvEs thE ACtivE ______ oF thE pAtiEnt in thE moDiFiCAtion oF his ConDition.
A．prEsEntAtion
B．ApprEhEnsion
C．pArtiCipAtion
D．ApprECiAtion