Third option is the correct explanation. Sasha did not withdraw or deposit any money in period C.
What is a constant function?
A function f(x) is said to be a constant function if the value of f(x) does not change (constant) for all input values of x. i.e.,
f(x) = c ∀ x ∈ domain of the function, where c ∈ R.
If we plot x vs constant function f(x), it will be a straight line parallel to x-axis.
In the given figure Account balance of Sasha's checking account is plotted as a function of time. In the figure we can observe that in region C the amount balance in Sasha's account does not change with days on the x-axis.
This says in region C the function is a constant function.
⇒ Sasha's account has not been credited or debited with money in region C. If Sasha is the only person who has access to the account, then it is evident that Sasha did not deposit or withdraw any money from the account.
∴The third option 'Sasha did not withdraw or deposit any money' is the best explanation.
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