SAT Boundaries Question

D In a US national election, one might expect major-party campaigns to focus on the most populous states. However, if polls and past voting data suggest that the outcome in a given state is a foregone conclusion, a campaign will not invest its resources there. Ultimately, a state's voting record and polling data, not its population size, its importance to campaigns. Which choice completes the text so that it conforms to the conventions of Standard English?