Answer:
B) the 1996 Olympic Games
Step-by-step explanation:
"HERO" stands for "Highway Emergency Response Operators." It is a program which was implemented in 1994. It was meant to lessen the traffic congestion as a preparation for the upcoming "1996 Olympic Games." It also provided assistance services to stranded vehicles, such as those which incurred a flat tire.
So, the "cause" in the diagram's "effect" above is choice B, "the 1996 Olympic Games."
Thus, this explains the answer.