Stud(s) of a common wooden partition A. Are vertical wooden members B. Is the upper horizontal wooden member C. Is the lower horizontal wooden member D. Are the intermediate horizontal wooden members

The correct answer is A. Studs of a common wooden partition are vertical wooden members. They are typically spaced 16 inches on center and support the drywall or other wall covering.

B is incorrect because the upper horizontal wooden member is called a header.

C is incorrect because the lower horizontal wooden member is called a sole plate.

D is incorrect because the intermediate horizontal wooden members are called joists.