The correct answer is B. 56.
The DSP56000 is a family of digital signal processors (DSPs) developed by Texas Instruments. It was introduced in 1986 and was one of the first DSPs to use a Harvard architecture, which separates data and program memory. The DSP56000 has a 56-bit accumulator, which is used to perform arithmetic and logical operations on data.
The other options are incorrect. Option A is incorrect because the DSP56000 has a 56-bit accumulator, not a 28-bit accumulator. Option C is incorrect because the DSP56000 has a 56-bit accumulator, not an 112-bit accumulator. Option D is incorrect because the DSP56000 has a 56-bit accumulator, not a 14-bit accumulator.