This question is focused on the understanding of verb tenses in English grammar. The correct answer is 'C. Simple Past' because it is used to describe actions that occurred in the past with no connection to the present. Option A is incorrect because the 'Present Continuous' tense is used for actions happening right now. Option B is incorrect because the 'Past Perfect' tense is used for actions that happened before another past action. Option D is incorrect because the 'Future Tense' is used for actions that will happen in the future. The key point is to identify the correct tense for past actions.