Amy has been given three jugs of different sizes and has been asked to measure different amounts of liquid using only those three jugs. Across five trials the correct solution could be made by taking a unit from jug A$,$ filling jug C with jug A$,$ and then pouring the remains of jug C into jug B$.$ When given a sixth problem she solves it using the same approach instead of an easier one$-$step solution that would have given the correct answer. Which of the following is Amy displaying?

Question $66$ options:

conjunction fallacy

confirmation bias

mental set

availability heuristic