Why Do We Make So Many Errors in Decision Making,according

Why do we make so many errors in decision making,according to the theory of bounded rationality

A)  Our brains have evolved to solve problems that are different from many of the problems we currently face in our modern environment. 
B)  We are incapable of actually considering all the factors necessary to make an optimal decision. 
C)  We have poor mathematical abilities, and so we miscalculate risks and benefits. 
D)  We are far too affected by our emotions to make difficult decisions.