While drilling at 4,000 feet with casing set to 2,000 feet, the well kicks with mud weight in the hole. Mud pumps are shut down and the blowout preventer is closed. Compared to the drilling situation, the pressure on the casing seat will be __________.

Correct Answer: Option D — increased

When a kick occurs and the BOP is closed, the well is shut in. The pressure from the influx is trapped, causing the pressure at the casing seat to increase significantly compared to the circulating condition. This pressure spike tests the integrity of the formation at the casing shoe.