Correct option is C
The correct substitution of the highlighted segment is (c) "wedding guests is kept there, on." The correct grammatical structure requires singular verb agreement with "list" (the true subject), and the preposition "on" is used with "table," not "in."
Therefore, "is kept there, on" correctly reflects both the verb agreement and prepositional use.
Grammatical rule used: Subject-verb agreement requires that verbs conform to their subjects in number.
Additionally, the correct preposition for items placed on a surface is "on" rather than "in."
Example: The list of items is on the desk.