Answer:
It would give populous states more voice in the new government.
Explanation:
According to the Virginia plan, the numbers of seat that's given to lawmaking bodies for each states will be depended on the number of citizens that live in that state.
More citizens will give the state more seats within the government.
Having more seats will be beneficial, since the states will also acquire larger amount of votes that can increase their chance of passing legislations that are favorable to their state. At that time, South Carolina was one of the most populous state In the country. So, voting in favor of Virginia plan will be very beneficial for them.