well to me, its answer could vary w.r.t the nationalist adherences ;
1; for local baloch sardars(Marri,Mengal and Bugti) it could be the option 'a'(bcoz gwadar port is only for punjabi and karachite industrialists)
2; for musharraf, it could be the missing 'd',(bcoz both local balochs as well as far off industrialists will benefit equally from this project)
P;
just kidding, its really a tricky one