Based on Spanish grammar the sentence a is grammatically incorrect. the verb paseo is not in the correct verb agreement.
How to conjugate a verb in spanish?
Verbs are divided into three groups called conjugations, which are identified by ending the verbs in their unconjugated infinitive form. Each of the conjugations has its own inflections, but usually the second and third are very similar.
Grammatically correct
Yo ayer pasee mucho.
I walked a lot yesterday.
Learning Spanish takes practice, and that's great practice.
Aprender español requiere práctica, y eso es una gran práctica.
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