Which of the following is the standard unit of measurement for wood in the US?

In the context of the United States, the standard unit of measurement for wood is inches. This measurement is commonly used in the lumber industry for determining the dimensions of wood products, such as boards and planks. For example, a board may be described as being 2 inches by 4 inches, which is a standard size in construction and carpentry.

While centimeters and millimeters are units of measurement commonly used in countries that follow the metric system, they are not the standard in the US lumber industry. Feet is also a unit of measurement that is used, particularly when referring to the length of larger pieces of wood, but the primary dimensions of lumber are typically expressed in inches. Thus, inches is the most accurate answer as the standard unit for the dimensions of wood in the US.