TOPIC: About "Lesson learned"

Hi, Dear all
I'm preparing PMP exam in Oct and have a questions like;

Now you are the PM of the environmental project. There is a project that has been delayed due to problems with environmental laws in the past.
Which of the following do you refer to?
A) Project Management Plan
Lesson and Learned
C) EEF
D) OPA

I selected the answer is D) cause of lesson learned repository thru the project in the past.

Am I right or wrong?
Could you give a advice/comments?

Yours Sincerely,

Tyrone (from South Korea)