Why couldn't anybody see ms. applebees apple?

The reason why nobody could see Ms. Applebee's Apple is likely due to the concept of selective attention. Selective attention is a cognitive process in which individuals focus on specific aspects of their environment while ignoring others. In this case, it's possible that the Apple was in Ms. Applebee's possession or placed in a location that did not attract attention from others, leading to the perception that the Apple was invisible.