Answer:
The answer is B. Functional fixedness.
Explanation:
Functional fixedness refers to the inability to use an object in a different way than usual. For example, a person looking for a pair of scissors to cut paper may not realise it's also possible to use a utility knife or even a ruler.
Some studies reveal that functional fixednes is not presented in young children. Instead, this problem might appear around age seven, when children learn to use certain objects "properly".