Curtis Is Working on a Presentation and Doesn't Hear the Phone

Curtis is working on a presentation and doesn't hear the phone ringing in the background.Later,he is surprised to find three phone messages have come in for him,because he was totally unaware that the phone had even rung.Incidents of this type would lend support to

A) a late-selection model of attention.
B) a proactive model of attention.
C) an early-selection model of attention.
D) an acoustic-blocking model of attention.