The correct answer to this open question is the following.
Although you forgot to include the options for this question, we can say the following.
What is Saudi Arabia's second-largest export, a radical form of Sunni Muslim, called? The answer: Wahhabism.
This is a Muslim ultra-conservative and extremist doctrine that aimed to return monotheistic worship by its followers. It was founded by Muhammad ibn Abd al-Wahhab. That is where the name of the doctrine comes from. This doctrine preaches the unity of God and does not recognize other idols from other Muslim doctrines. Wahhabism did not support the veneration of saints or the visiting of their temples to honor them.