Why does collecting data beyond five years provide little value for calculating CLV$?$

Question $10$ options:

a$)$

At five years, it becomes too likely that data collected at the beginning of the cycle is no longer accurate.

b$)$

None of these are correct.

c$)$

The discount for the cost of capital becomes so high that future revenue streams have little value.

d$)$

The discount for the cost of capital becomes so low that everything except for future revenue streams becomes irrelevant.$$