A. Dan should hope his flight uses configuration B. B. Dan should hope his flight uses configuration A.

C. Dan is equally likely to get an aisle seat with whichever configuration his flight uses

D. There is not enough information to determine which configuration Dan should hope his flight uses

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.