Final answer:
The range for an n-bit two's complement binary system is from -2^(n-1) to 2^(n-1) - 1, and for 8-bit binary, it is from -128 to 127.
Step-by-step explanation:
The range of numbers that can be represented with an n-bit two's complement binary system is indeed from -2(n-1) to 2(n-1) - 1. For an 8-bit binary system, the range is from -128 to 127. Therefore, the correct answer is a. The range is from -2(n-1) to 2(n-1) - 1; for 8-bit binary, the range is from -128 to 127.