The sources of motivation are grouped as natural and acquired. Natural sources are inborn and work without any training, while acquired sources are built up by experience, repetition and contact with the surroundings in which a learner grows.

The inborn tendencies that make every member of a species act in fixed ways, the urge to protect oneself from danger, and the hidden layer of the mind that stores wishes pushed out of awareness all belong to the first group, because every child shows them without being taught by anybody.

A liking that develops for a particular object or activity after pleasant dealings with it is plainly built by experience, and it differs from one child to another for that very reason. Such a liking then draws attention and effort towards the object, which is why it is counted among the sources of motivation that a learner gains rather than inherits.

Interest option is correct.