The Concept of Selective Attention Is Best Demonstrated in Which

The concept of selective attention is best demonstrated in which of the following examples?

A) Remembering the names of your clients by creating clever mental associations
B) Learning to play a song by listening to only the cello parts of a string quartet
C) Recalling only fond memories of your sister when you are feeling happy
D) Using a familiar location as a means to remember a long list of groceries you need to buy