Saddam Hussein invaded Kuwait because they refused to forgive Iraq's war debt, starting the Persian Gulf War. Option C is correct.
The Invasion of Kuwait on 2 August 1990 was a two-day operation directed by Iraq against the neighboring State of Kuwait, which led to the seven-month-long Iraqi occupation of the country.
Saddam Hussein Abd al-Majid al-Tikriti was President of Iraq from 16 July 1979 until 9 April 2003.