The time of sunrise is a natural phenomenon which is an example of periodic behavior
A periodic behavior refers to something that happens in regular intervals, such that the time between these intrevals, T, is called the period.
A simple example of this is how the week works, we know that if today is Monday, then exactly seven days from now it will be Monday again, so in this case, the period is 7 days.
So we just need to look at the given options and see which one is the periodic one.
A) amount of population in Las Angeles as a function of time.
The population in a city usually increases as time passes, so this is not periodic.
B) Your average daily bank balance.
Assuming you have a steady job and you control a lot your expenses, this could be periodic (when we look at the whole month) but this is a specific case, so this is not the correct option.
C) The population of a city over time.
Same as option A.
D) Time of sunrise each day.
This is periodic, as each day the sun rises at about the same time (depending on the position of the Earth), so the sunrise is a natural phenomenon which is an example of periodic behavior
Then the correct option is D.
If you want to learn more about periodic behavior, you can read:
https://brainly.com/question/16061498
