Laborious in this sentence means a task which requires a lot of efforts.
Answer: Option C.
Explanation:
Suffix is a kind of affix which is placed after the stem of the word in the word. This explains about the grammatical case of nouns and adjectives.
The word that has been used in the sentence which describes about the activity of the sentence is laborious. The activity speaks about that this task which is of making a four course dinner is not going to be easy and requires a lot of efforts in it.
