Suppose Jon Stewart of the "Daily Show" Makes an Annual

Suppose Jon Stewart of the "Daily Show" makes an annual income of $1,000,000. If he quit his television job and went into producing he could make $400,000 per year. Jon Stewart's opportunity cost as a producer is

A) $1,400,000.
B) 1,000,000.
C) $400,000.
D) $600,000.