Answer:
Option: C is the correct answer.
C) It is not a function because each package number has two different prices.
Explanation:
Function--
Function is a mapping from a set A to set B such that each element of set A is mapped to a unique number.
i.e. every element has a single image.
Here a package number has two different rates or prices.
(Since let set A is package number and set B is a price of the package. )
As element of set A has more than one image.
Hence, it is not a function.