B false data does not only have to be facts
The answer is B. A only. The optimum valve timing is found through experimentation using an engine dynamometer. The timing of the opening and closing of the valves is called valve timing. So the use of dynamometer measures the power output of a machine that is why it can measure the optimum valve timing.
(I am not sure what you are asking since question is not specific enough),
I am assuming you are asking why organizing a file on a computer is a key skill-
It is because today’s workplace should have as much organization as possible for a steady workplace and work environment, making needed files easy to access.
Exel is used for graphing, Word for any type of essay or paper, and Powerpoint for presentations.
Hope this helps!
