Your project you just complited , was the first time your company ever contracted a third party vendor to perform some of the project work.

Thanks for the invitation. I would like to choose option D as my answer.

D. Evaluations of what went right and what we could have done better.

Option D:  As .l.Lesson learned is evaluations of

1. what went right,
2. what went wrong and
3. what we could have done better.

Thanks for the invite.

Option A - A complete list of the contract as built drawing is the most appropriate answer. 

My answer is option (D) --------------

I seem A is comparatively good answer. 

option (D) is the correct answer