In learning by doing, learning comes through:

The correct answer is Experience. The concept of "learning by doing" fundamentally emphasizes that knowledge and skills are acquired through direct engagement and practical application, rather than passive reception.

• Experience: When individuals actively participate in tasks, experiments, or real-world situations, they gain firsthand understanding and develop competencies. This direct interaction with the subject matter is the essence of experiential learning.

While 'Observation' and 'Imitation' can be components of learning, they often precede or accompany doing, but the core mechanism of "learning by doing" is the personal experience gained from the action itself. 'Theories' provide frameworks but are not the direct means of learning in this context; rather, theories are often applied or tested through doing.