单选题 Which statement is c0rrect regarding the degree Of p0lymerizati0n Of methyl methacrylate in denture base acrylic resin（ ）。 A、n0 residual m0n0mer exists after pr0cessing a heat activated acrylic resin at 165℃ f0r 8 h0urs B、m0re residual m0n0mer exists in a denture that is pr0cessed by chemical activati0n than.by heat activati0n C、residual m0n0mer in a denture can 0nly be eliminated by raising the temperature t0 212 f0r 1 h0ur after pr0cessing.