A person solves linear equations in algebra for a number of days and becomes progressively more efficient, more accurate and faster in solving them. This progressive improvement in performance is a form of transfer known as

The progressive improvement in solving equations across days is learning to learn, a positive transfer of learning skill.

Generalization (B) is applying a learned response to similar stimuli, not improving efficiency over practice.

Transposition (C) is transferring a relationship between stimuli, not skill in learning itself.

Identification (D) is recognising or naming stimuli, unrelated to this improvement.

Learning to learn is also called a learning set, studied by Harry Harlow.

It reflects positive transfer, where earlier learning aids later learning.