B) The southern most states relied most heavily on one crop
Explanation:
Because of how the climate is in the southern regions, it was an ideal place to grow cotton on. Along with the fact the cotton was so cheap to purchase because of slave work, the South became more and more reliant on this crop to make profits.
Especially when the cotton gin became widespread in the south is when slavery became more and more apparent and was relied on more in the south.
