Gerrit Rietveld used lumber cut in standard sizes for his Red-Blue chair because he hoped the chair would later be mass-produced, not hand-crafted. Opyion B is correct.
Gerrit Thomas Rietveld was a Dutch furniture designer and architect. He was one of the major members of the Dutch artistic movement known as De Stijl, Rietveld and became well known for his Red and Blue Chair as well as for the Rietveld Schröder House, which constitutes a UNESCO World Heritage Site.
