Answer:
a. realizing that things that are cars can also be vehicles
Explanation:
Piaget went to study stages of development in early childhood, he noticed some children had problems with class inclusion:
The ability to classify objects in 2 or more categories at the same time.
In a typical example as shown below, children are asked to recognise large categories by asking: are there more dogs or animals?
Notice animals includes dogs, as a subcategory
Piaget showedt children in the pre-operational stage of development had difficulty answering questions like ‘are there more dogs or animals?’
