How many studs are required at each corner of an exterior wall in conventional light-frame construction?

In conventional light-frame construction, corners of exterior walls require three studs for several structural and functional reasons. The three studs at each corner provide increased strength and stability to the wall assembly, ensuring that it can better withstand lateral loads, such as wind pressure. This arrangement also allows for a secure connection between the two intersecting walls, accommodating the sheathing and finishes while maintaining the integrity of the overall structure.

Additionally, having three studs accommodates the framing of windows or doors that might be placed near the corner. It provides the necessary support for headers and proper alignment for finishes. This configuration helps address issues such as racking, which can occur when walls are subjected to forces, helping ensure that the building remains square and plumb.

The other choices fall short because using fewer than three studs would not provide the same level of structural integrity or support required in conventional construction practices.