Which of the Following Statements Is a Valid Reason for Inconsistencies

Which of the following statements is a valid reason for inconsistencies in opinions of damages experts?

A) A large component of economic damages is past damages, the calculation of which relies on projections of inherently uncertain past events.
B) Economic damages calculations require the application of logic, which allows for multiple interpretations.
C) Damages are calculated for specific individuals or entities, with many unique attributes that are universally perceived or evaluated.
D) All past economic damages must be reduced to present value, which requires the application of a discount rate.