The word 'laborious' means requiring effort, as it describes the process of cooking a four-course dinner as challenging. The suffix '-ious' indicates the qualities of hard work associated with the task. Therefore, the correct answer is option C: requiring effort.
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The word 'laborious' refers to tasks that are challenging and require effort. Given the suffix '-ious,' it indicates that cooking a four-course dinner is a demanding process. Therefore, it correlates with the meaning of 'requiring effort.' ;