Why did the George H.W. Bush choose not to overthrow the Iraqi government following Operation Desert Storm?

Why did the George H.W. Bush choose not to overthrow the Iraqi government following Operation Desert Storm? A. He feared the Iraqi army might retaliate with chemical weapons, B.He wanted to avoid a complicated occupation of the country, C.He worried that overthrowing the government would cost too many American lives, or D.Congress had not authorized the President to topple the Iraqi government.