Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the  correct answer to each of the questions

A newborn baby can see, hear and feel. By the age of five, a child can talk, ride a bike and invent imaginary  friends. How does this development happen? We don't understand the way language, thinking and planning  develop very well. Now scientists are using new technology to ‘see’ into children's brains. And they are  discovering new information about the way a baby's brain develops. 

A study in 2010 showed that the experiences a child has in their first few years affect the development of the  brain. It showed that children who received more attention often had higher IQs. The brain of a newborn  baby has nearly a hundred billion neurons. This is the same number as an adult's brain. As they grow, a baby  receives information through the senses of sight, hearing, smell, taste and touch. This information creates  connections between different parts of the brain. At the age of three, there are a hundred trillion connections. 

One experiment looked at images of babies' brains while they were listening to different sounds. The sounds  were in different sequences. For example, one sequence was mu-ba-ba. This is the pattern 'A-B-B'. Another  sequence was mu-ba-ge. This is the pattern 'A-B-C'. The images showed that the part of the brain responsible  for speech was more active during A-B-B' patterns. This shows that babies can tell the difference between  different patterns. This experiment is interesting because sequences of words are important to grammar and  meaning. Compare two sentences with the same words in a different order: John killed the bear' is very  different from 'The bear killed John.' So babies are starting to learn grammatical rules from the beginning of  life. 

Researchers also know that babies need to hear a lot of language in order to understand grammar rules. But  there is a big difference between listening to television, audio books or the internet, and interacting with  people. One study compared two groups of nine-month-old American babies. One group watched videos of  Mandarin Chinese sounds. In the other group, people spoke the same sounds to the babies. The test results  showed that the second group could recognise different sounds, however the first group learned nothing. The  scientist, Patricia Kuhl, said this result was very surprising. It suggests that social experience is essential to successful brain development in babies. 

(Adapted from "Select Readings - Upper Intermediate" by Linda Lee and Erik Gundersen)

It can be inferred from the passage that ______.

• A. 
  A pattern like 'A-B-C' is easier to understand.
• B. 
  Children can actually learn grammatical rules in their very early age.
• C. 
  It's not known which area of a baby's brain processes speech.
• D. 
  Babies' brains cannot recognise different sound patterns.