When cutting sheet metal too thin to be held in your hand while using a hand held hacksaw, the sheet metal should be placed between two __________.

Correct Answer: Option D — blocks of wood

Sandwiching thin sheet metal between two blocks of wood provides necessary rigidity and prevents the material from vibrating or buckling during the cutting process. This technique ensures a clean, accurate cut while protecting the operator's hands and maintaining the structural integrity of the metal workpiece during manual hacksawing.