In trial and error learning, we learn an activity by

In trial and error learning, we learn by making mistakes (Option B). This learning method involves attempting solutions, encountering errors, and adjusting based on feedback until successful. The term 'trial and error' literally means learning through repeated attempts and the mistakes encountered during them. Options A, C, and D describe other learning methods - imitation, intuition, and repetition - which are different from the trial and error approach.