Final answer:
The word 'representative's' in the sentence is a singular possessive noun, showing ownership of the voting record by one representative.
Step-by-step explanation:
The word in bold in the question is "representative's". This is a singular possessive noun, which is an option (b) from the choices given.
A singular possessive noun shows that one person, place, or thing has or owns something. In this case, the word indicates that the voting record belongs to one representative.