If he heard that we talk about anything going out , he will start to asking to go " tai tai ( going out ) " . He will be talking loudly and happily in his own language if I am driving him out in my car . Whenever I tried to hide from him and he could not find me , he would shout out loudly for " TU - TU ( auntie ) " .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason that he talks in his own language ?
Options:
- Because he is in the car .
 - Because he wants to go out .
 - Because he is a baby .
 - None of the above choices .


Because he is a baby .