The correct answer is:
A. to ensure the less populous Northern states would have the same representation as Southern states
The New Jersey Plan, proposed during the Constitutional Convention of 1787, aimed to provide equal representation for each state in the legislature, regardless of population. This was primarily a response to the Virginia Plan, which favored larger states with higher populations. By proposing an equal number of senators per state, the New Jersey Plan sought to protect the interests of smaller states, particularly in the context of the ongoing tensions between states with larger and smaller populations.