The Table Below Shows Hypothetical Monthly Cell Phone Plan Fees

Multiple Choice

The table below shows hypothetical monthly cell phone plan fees for the identical service over several years. TABLE 2-2 Refer to Table 2-2.Assume that 2015 is used as the base year,with the index number = 100.The value of the index number in 2017 is

A) 100.
B) 0.72.
C) 72.73.
D) 1.375.
E) 137.5.