Fox and Crow Are Both Thirsty

Multiple Choice

Fox and Crow are both thirsty. They come upon a large crock with some water in it, but cannot lift the pitcher or reach down to the water. There happens to be a bucket of baseballs nearby and Fox steps back to throw the baseballs to try to break the crock. Crow reminds him that this will only spill the water, and uses the more clever solution of dropping the baseballs into the crock to raise the water level to within reach. Fox's problem was

A) functional fixedness.
B) attention deficit disorder.
C) attentional blinking.
D) over-generalization.