Answer:
correct option is b) hindsight
Step-by-step explanation:
given data
before = 50 %
after = 75 %
solution
as we know that 50 % of people say yes for elected President as Barack Obama and after result same people say 75 %
so we can say that this is an example of hindsight because hindsight bias is that type of they pre disposition to assert outcome and event simply predictable already once happen like sporting and political event or prophecies
we can also say here it is overestimation of one is capability to foresee outcome
and we have given that after result outcome of the election more number of people agree that they also predict correct
so here we can say that correct option is b) hindsight