Question about commas

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Tenacious Learner

Senior Member
Spanish
Hello teachers,
Which option is right? I think it's 'b', but I don't really know why. Could you explain why?
a) The simple past expresses actions or situations that occurred at a definite point in time, recent or not, in the past.
b) The simple past expresses actions or situations that occurred at a definite point in time in the past, recent or not.

Thanks in advance.
 
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