Penalty cards(Yellow, Red) used in Football first introduced in which year?

A. 1970
B. 1974
C. 1996
D. None of these

Yellow and red cards were introduced at the 1970 FIFA World Cup™ in Mexico, and have since become part and parcel of the game. But we would be doing Mr Aston a great disservice if we limited his influence on refereeing and football to his famous brainwave.