Answer:
a. After practicing, Andy now rides his bicycle without training wheels.
Explanation:
According to my research "learning" is defined as "the acquisition of knowledge of skills through study, experience, or being taught". This being the case the only example given that would land under the classification of learning would be a. After practicing, Andy now rides his bicycle without training wheels. This is because this is the only example were someone is practicing in order to gain a new skill. The rest of the examples are caused by either instinct or other variables but not from learning.
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