Jonah, a five-year-old, utters the phrase 'we goed to the park.' Jonah's utterance is an example of which of the following concepts?

Overextension involves a child applying a word too broadly, using a single term to cover multiple objects or concepts. An example would be calling all four-legged animals "dog." Jonah's error does not reflect an overextension of meaning but rather a misuse of grammatical rules, making this choice incorrect.

Underextension is when a child restricts a word's meaning to a narrower context than is typical. For instance, a child might only refer to their pet as "dog" while not applying the term to all dogs. Jonah's example does not involve a restrictive use of language, thus this option is not applicable.

Fast mapping refers to the rapid acquisition of new words and their meanings after minimal exposure. Jonah's use of "goed" does not involve the learning of a new word, but rather the misunderstanding of an existing word's form, making this choice incorrect.

Syntactic bootstrapping is the process by which children use the syntax of a sentence to infer the meaning of a new word. Jonah's utterance does not illustrate this process; instead, it shows a misapplication of grammatical rules, so this choice is also incorrect.