Which aircraft condition could result in an increased stall speed?

An increased bank angle during a turn leads to an increased stall speed due to the greater load factor acting on the aircraft. When an aircraft is banked, it creates a horizontal component of lift that must counterbalance the weight of the aircraft. As the bank angle increases, the load factor increases, which means that the aircraft requires a higher angle of attack to maintain level flight. This situation raises the stall speed because the stall speed is directly influenced by the load factor; the greater the load factor, the higher the stall speed.

In a turn, as the bank becomes steeper, the pilot must maintain additional lift to counteract the increased weight effect created by the load factor, which results in the conditions leading to a stall occurring at a higher true airspeed.

The other choices reflect conditions that do not inherently lead to increased stall speeds. Reducing weight, for example, tends to lower stall speed since less lift is required to support less weight. Lowering the flap setting typically increases stall speed because flaps enhance lift at lower speeds, and reducing them means that the aircraft can stall at a lower angle of attack. Increasing altitude affects the density of air and stall speed but does not inherently lead to a direct increase in stall speed under normal conditions, contrary