Every Day You Are Bombarded with Countless Noises and Sounds

Every day you are bombarded with countless noises and sounds, often simultaneously. What is interesting is that you often only hear what is important to you and other sounds can get "drowned out". Which part of the sensory integration process is this most similar to?

A) filtering which information passes on
B) relaying incoming sensory information
C) allowing the information to continue as is
D) this is not similar to sensory integration