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

1.	Why is the width of the data bus so important to the processing speed of a computer?
A.	The narrower it is, the greater the computer's processing speed
B.	The wider it is, the more data that can fit into main memory
C.	The wider it is, the greater the computer's processing speed
D.	The wider it is, the slower the computer's processing speed
E.	The data bus isn't important to the processing speed of a computer
Answer» D. The wider it is, the slower the computer's processing speed

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

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