Iraq invaded Kuwait during the Persian Gulf War primarily for economic reasons, particularly over issues related to oil production and debt. However, none of the options provided in your question is correct.
The closest relevant context is related to Iraq's desire to gain access to Kuwait's oil reserves and to address disputes over oil production levels and debt incurred during the Iran-Iraq War.
If I were to choose the most related option, even though it doesn't directly address the main reasons, I would mark "To support the Sunnis in their civil war" as it's the only one that touches on a regional context, even though that wasn't the actual motive for the invasion of Kuwait.
Let me know if you need further clarification or information!