Determine whether IPMVP Option B or Option D is most appropriate for the project design. (Option C, which was allowed in earlier versions of LEED, is not allowed, as it is considered less accurate, and doesn't allow for M&V of individual energy conservation measures.)

Option B is based on engineering calculations using metered data and is generally appropriate for smaller buildings without interactive systems. You will need to verify compliance with Option B for projects with more complex control systems. 
Option D uses calibrated whole-building energy simulations for both the baseline and design case and is generally appropriate for larger, more complex buildings where energy modeling has or will occur.