Ok we kneed to find which situation can integer 16 represent, so this integer is positive which represents an increase, so let's check the options one by one:
In the first option 16 stairs are climbed, which implies a profit, this option may be correct, let's look at the others
The second option represents a descent, then this option is not correct.
The third option It also implies loss, so it is not correct either.
And the fourth option represents having less money in our wallet, then it also implies loss, therefore it is not.
So the correct option is the first