This is a tricky one.
And the option A and C marked here are same.
Coming back to question, All of them are correct answer if we see OPA in general.
But here the question has key.. "influence".
If we see the options again what has the most impact.
Option D as you marked is just a guiding document not the influencing one.
Option B will also has some influence but option A=C has more influence on your decision about how to go about details of charter. So the answer from the system is correct.
Hope this help in clarifying.
We can discuss further if it is not clear yet. Saving Changes...
Stéphane ParentSelf Employed / Semi-retired| Leader MakerPrince Edward Island, Canada
According to PMBOK Guide 6, they all influence the Develop Project Charter process! Saving Changes...