ACCorDing to thE pAssAgE, whiCh oF thE Following is not A FACtor in thE ComplEtE unDErstAnDing oF priCE
A．instruCtions thAt ComE with A proDuCt.
B．thE quAntity oF A proDuCt.
C．thE quAlity oF A proDuCt.
D．guArAntEEs thAt CovEr A proDuCt.