D. It is personal in style.
Answer:
p(a) * p(b) = .01923
p(b) = .01923 / .07692 = .2500
In practice, something that follows a very predictable pattern can be used as a time standard. This include things like radioactive decay, planetary orbit, and the speed of light, among others.
You know you can skip those and just submit them, they don’t even check them
