The correct answer to this open question is the following.
A skilled tennis player's brain and body respond automatically to an oncoming serve before becoming consciously aware of the ball's trajectory. this best illustrates our capacity for dual processing.
When we think and make decisions, our brain uses two ways of thinking. One is consciously processing of things when we have time to deliberate what is the best option, and after considering the options, we decide. The other is base on our intuition. We could say that is our subconscious helping us to react. This process can best be identified when we react to prevent an accident or in a sports contest when the player had to react instead of thinking.