Question

Last question on a test and can't figure out how to do it :/ Can anyone please explain how to? Would be very helpful ^^

Jess has collected a set of data and calculated the range to be 18. She is then told to add the following numbers to the set: {23, 26, 44, 45}

The new range of her data CANNOT BE
A)
21
B)
23
C)
25
D)
27