Which of the following was a root cause of the Great Depression?

There are several roots, will explain them, since that options were not written.

Explanation:

The most important I believe are:

The Clash of the Stock Market. Bank Failures. Drought conditions. Reduction of the purchases.

Answer: Overproduction by factories

Explanation: Factories and other sources were producing far more goods than people could afford, which caused prices to sky rocket down. Causing people to be laid off to counteract those prices, etc.