Use the Following to Answer Questions

Use the following to answer questions :
Scenario I
The scenario describes research findings discussed in the following review article:
Cameron,C.C. ,& Thaler,R.H.(1995) .Anomalies: Ultimatums,dictators,and manners.Journal of Economic Perspectives,9(19) ,209-219.
In the ultimatum game,two participants are assigned to be either the "Divider" or the "Decider" by a coin flip.The Divider is given a sum of money,such as $10,and is instructed to offer some nonzero portion of it to the Decider.If the Decider accepts,she gets to keep what was offered and the Divider keeps the rest.If the Decider rejects the deal,both players get nothing.Both players are made aware of all these rules and then the game begins.Under these conditions,Dividers usually offer a little less than $5 and Deciders usually accept this amount.If Dividers offer less,Deciders often reject and both players get nothing.A similar game is termed the dictator game.Players are randomly assigned to be either the "Allocator" or the "Receiver." The Allocator is given a sum of money and makes a decision about how much money she would like to give the Receiver,who must accept this result.Allocators in this game usually offer some money to the Receiver but typically less than they offer the Dividers in the ultimatum game.
-(Scenario I) Sceptics of the results of the original ultimatum game criticized the research for drawing conclusions based on games involving small amounts of money not representative of important real-life economic decisions.This was a criticism associated with the _____ of the research.

A) reliability
B) internal validity
C) external validity
D) statistical significance