A Professional Gambler Moves from a State Where Gambling Is

Multiple Choice

A professional gambler moves from a state where gambling is illegal to a state where gambling is legal. Most of his income was, and continues to be, from gambling. His move

A) necessarily raises GDP.
B) necessarily decreases GDP.
C) doesn't change GDP because gambling is never included in GDP.
D) doesn't change GDP because in either case his income is included.