Which Statement Is Correct for a Simple Index Number

Multiple Choice

Which statement is correct for a simple index number?

A) For the base year, the index is set to 0.000.
B) We cannot use index numbers to compare two time series measured in different units.
C) The simple relative index for period t = 5 is calculated as Y₅/Y₁.
D) Weighted index numbers have few practical applications because of their complexity.