NEC ECC: Which criteria should be considered in the Option Choice?

I am currently carrying out a post completion review on the choice to adopt the use of an Option B contract for a highway maintenance scheme, which encountered several changes during construction due to unforeseen's, notably the drainage design.

I am keen to understand next time what should be considered in the selection of the option, i.e. what factors should be considered between selecting either Option A and C, or Option B and D.

Any advice would be greatly appreciated