I assumed since it was invisible to me , it was invisible to everyone . This is also probably a form of confirmation bias . Actually this might be related to another cognitive bias people exhibit - what I call the I ' m Special bias . Basically , I think asking people why they do things is pointless - they do n't know and , worse , everyone in the world believes they are special .

OPT:
(a). Because they were conducting an experiment ..
(b). None of the above choices ..
(c). Because the point was invisible to them ..
(d). Because they believed in themselves ..
Answer the following question: Why is the narrator suceptible to confirmation bias ?
(c).