The answer is the first one (A): Lumber and solid sawn lumber.
Explanation for each option:
A) Lumber and solid sawn lumber: This is correct. "Lumber" generally refers to wood that has been processed into beams and planks, a stage in the process of wood production. "Solid sawn lumber" is a type of lumber that is cut directly from logs, as opposed to engineered wood products. Therefore, these terms can be used synonymously.
B) Lumber and wood: This is incorrect. While lumber is a type of wood, "wood" is a broader term that includes all forms of wood, including raw logs, branches, and other forms that are not processed into lumber.
C) Lumber and laminated veneer lumber: This is incorrect. Laminated veneer lumber (LVL) is an engineered wood product made by layering thin sheets of wood veneers and bonding them together with adhesives. It is a specific type of product distinct from general lumber.
D) All of these: This is incorrect because options B and C are not synonymous with lumber.
In summary, the terms "lumber" and "solid sawn lumber" are used synonymously.