The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
A child spent the first 5 years of his life isolated from the outside world and as a result, never learned to speak. This is an example of a Feral child.
As strange as it sounds, there have been cases in which children lived in total isolation for the four of five first years of their life. Believe it or not.
When the child has no contact with another human, it cannot speak. It has no sense of language.
Most of these children were abandoned or abused, so this creates a trauma that only professional psychologists can resolve.