When rajesh was 5 years old, he learned how to ride his bike. when he first learned to ride, he had to concentrate on keeping his balance and not falling. rajesh, now 10 years old, does not have to consciously think about keeping his balance on his bike. rajesh's ability to do this is caused by the process of

The answer is automatization.

Explanation:

When we reach this stage in the learning process, we no longer think about our actions. Instead, they are carried out in a subconscious, automatic manner, and no longer require deep attention.

Although automatization concerns different types of memory, such as semantic, it has especially been linked to muscle memory.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

the answer your looking for is c. : )