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I believe the correct answer from the choices listed above is option A. It is at about 1 year old that the brain begin "pruning". It is thought to be a process   of removing neurons which may have become damaged or degraded in order to further improve the "networking" capacity of a particular area of the brain.
Correct Answer: Option A

Pruning is a natural process that occurs within our brains. It occurs during the phase when the child has to pass from childhood to adulthood. In simple words it can be said that during Pruning brain removes the extra connections that are no longer needed in the brain. 

Pruning starts at the very early age but continues for several years. So the correct answer to this question is option A. Brain starts Pruning at the age of 1 but most pruning occurs from age 2 to 10.

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