Why is the width of the data bus so important to the processing speed or a computer

Question

A) the narrower it is, the greater the computer is processing speed
B) the wider it is, the greater the computer's processing speed
C) the wider it is, the more data that can fit into main memory
D) the wider it is , the slower the computer processing speed

Answer 1

B) the wider it is, the greater the computer's processing speed