Economic indicator limitation

Which one is not the limitation of economic indicator?

A. It has been observed in the past that they are not effective on a consistent basis due to changes in the relationships between inputs.

B. Some data series are reported with a lag.

C. Some data series are subject to revisions.

All i got in my locker is; not consistently accurate & leading indicators can give false signals…

Best Guess is “B”

“A” is obviously wrong

I think “C” would have the same impact as “A”; hence, i chose “B”