Are the verb tenses in the sentence consistent, or do they shift unnecessarily?
the cat jumped onto the counter and licked the butter.
a. the verb tenses shift.
b. the verb tenses are consistent.

The verb tenses in this sentence are the same, in both case past simple is used. Which means that the correct answer is B, the verb tenses are consistent.

Focus on looking back over your arguments frequently. Keep yourself on track for the point that you're trying to create by staying both true and relevant to the topic at hand. Also, provide good support for your argument. Avoid making assumptions. Lastly, compare your argument to the list of all fallacies. Does your piece fall under any of those at any time? If so, you then know what to fix. Hope this helps.