Answer:
Option B) Speed is the answer.
Einstein's energy mass equivalence relation say that if the whole given mass is converted to energy then it would be

where
m = mass in kg
c = speed of light in m/s
this is the origination of quantum physics and by this formula we can relate the dual nature of light and particle
So correct relation above will be

Answer: "important and helpful" Show garret is paying close attention to her coach. Hope this help!
The answer is C guide and inspire good conduct