You cannot in pre-feasibility come up with one option. Things like hydro in a small country like Guyana have macroeconomic concerns, as well as the obvious engineering factors. How many pre-feasibility studies were done?
Sure you can. Sometimes there is clearly only one front runner when all factors are considered. What is evident is that you have no evidence that this was not done, yet your hatred for Jagdeo makes you jump to this conclusion.