What economic characteristic of the 1920s was a cause of the Great Depression?

high income tax rates
low tariffs on imported goods
overproduction of agricultural products
lack of available credit

I am between B and D i'm about 77 percent sure its B but the remaining 23 percent goes to D but i'm pretty sure the correct answer is B if not i'm sorry but im pretty sure its B because i remember this question slightly.

someone or something lol