I would say D) two high tides and two low tides each day
It's c/f, in which c is the speed of light (300000 m/s)
Cetane rating of the diesel ensures the low temperature and uniform combustion. Centane number is just opposite to the octane number of petrol engine, cetane number of diesel determines at which temperature the diesel will going to autoignite.
The truth is both of them are more reactive metal.
They can fight the infection but not the disease
