First person since it starts with I
A popular television series set in the far reaches of space
We live.—Knowing that today’s sun may give way to tomorrow’s rain.
The passage talks about how things are always changing. The only thing that is the same is the fact that things change. We see this in the last line of the passage when it says "Nought may endure but Mutability." Mutability is the tendency to change. It's saying that nothing endures (or lasts) like the tendency to change. The correct answer should continue this idea. Option B talks about how we know things will change from one day to the next with one day being sunny and the next rainy.