Ali Is Trying to Patch the Nail Holes on His

Ali is trying to patch the nail holes on his wall, but he doesn't have Spackle to cover up the holes. His friend Omer rushes to the bathroom and gets the toothpaste. Ali looks at him very surprised and does not understand what he is doing. Ali's failure to think that Omer is going to use toothpaste to cover up the holes on the wall is an example of

A) functional fixedness.
B) confirmation bias.
C) a natural concept.
D) availability bias.