Stammering is a habit disorder linked with lack of self-confidence. Basically, for a child to understand a language, there are four stages. The first is learning to understand the spoken language and the second is speaking. Both of these usually develop around the age of two.
The third stage is speaking complex sentences, which develops at around three, and the fourth is when the child recognises the written alphabet. In 80% of children while the 3rd and 4th stage are at play, the first two get disturbed because something new is being incorporated in the mind.
This is absolutely normal. But what over cautious mothers do is fret a lot and the child develops a fear which later manifests itself as stammering. In fact, most text books on stammering state in bold that "Had there not been any over cautious mothers, hardly anyone would have suffered from stammering." Fluency can be incorporated in the speech of such patients through hypnosis.
By the time the child becomes two years old he/she can.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → understand and speak simple language
The first two stages are understanding the spoken language and speaking, and the passage says both usually develop around the age of two. So a two-year-old can understand and speak simple language.
Why the Other Options are Incorrect?
Option 1: speak complex sentences — Incorrect. Wrong time: complex sentences are the third stage, which comes later, around the age of three.
Option 2: only understand foreign languages — Incorrect. Not mentioned: the passage says nothing about foreign languages, and the child can also speak by this age.
Option 4: write the alphabets — Incorrect. Wrong time: the fourth stage is only recognising the written alphabet, and it comes after the third stage, not at two.