The correct answer to this open question is the following.
Although you forgot to include the options, we can say the following.
The northern state economies differed from southern state economies in the early to mid-1800s in that the northern economies had solid industries, manufacturing plants, and extensive commerce. On the other hand, the southern states had practically no industry, limited commerce, and heavily relied on agriculture.
While the northern states developed manufacturing plants and solid industries, the southern states were basically dependant on slavery to grow crops in the large southern plantations. Slaves worked long hours under harsh conditions to grow the kind of crops that had to be exported to Europe.
