Question 5045 Deck General

The correct answer is A) GM. Increasing riser tension on a semisubmersible drilling unit reduces the unit's GM (metacentric height), which is a measure of its stability. As the riser tension increases, it creates an overturning moment that effectively lowers the unit's GM, making it less stable. The other options are incorrect because they do not have a direct relationship with the impact of increased riser tension. List (B) is a measure of side-to-side tilt, KG (C) is the vertical center of gravity, and KM (D) is the vertical center of buoyancy, none of which are directly affected by changes in riser tension.