Achild who says, my toy car breaked, or i runned up the hill, is demonstrating
a. overextension
b. telegraphic speech
c. overregularization
d. fast mapping

The correct answer is "overgeneralization". Overgeneralisation happens when children use irregular verbs or nouns as if they were regular, giving them a regular ending.

Overextension is when more individuals are understood under a name, for example "dog" for all animals.