The correct answer is C. Parity chip.
A parity chip is a small integrated circuit that is used to check for errors in data stored in RAM. It does this by adding a parity bit to each byte of data. The parity bit is a 1 or 0 bit that is added to the byte so that the total number of 1 bits in the byte is always even or always odd. When the data is read back from RAM, the parity bit is checked to make sure that it is correct. If the parity bit is incorrect, it indicates that there has been an error in the data.
ROM chips, microprocessor chips, and EPROM chips are not used to check for errors in RAM. ROM chips are read-only memory chips that contain permanent data that cannot be changed. Microprocessor chips are the main processing units in computers and other electronic devices. EPROM chips are erasable programmable read-only memory chips that can be programmed and erased multiple times.