Answer:
The answer is functional fixedness.
Step-by-step explanation:
Functional fixedness refers to the inability to use an object in a different way than usual. For example, if a person is looking for a pair of scissors to cut paper, he might not realise he can also use a utility knife or even a ruler.
Studies have shown that very young children do not present functional fixednesss. Instead, it appears around age seven, when children learn to use objects "properly".