Um vegetable oil comes from food and that not an option period.
Basicly option B that you provided on the list does not work at all period due to the need to produce mass quantity of food required to fuel all vehicles, which will be pointless and that food can be used to help africa and other places start having a real functioning economy and no one starving. This option should not be considered in any way from this point foward and if someone wants to consider it, it should be for helping Africa back on its feet.
While a morale suggestion, it's probably misinformed or at least misguided. Farm subsidies tend to indicate that we (the USA) can produce quite a bit more cooking oil (which, to clear up someone else's error, is vegetable oil) than we do currently.
And no, it's not required that aid go to Africa or some other continent that you consider to be in need of help. Best I can tell, most or all of the food sent to (for example) Somalia got diverted by that country's citizens. Also, I'd like to point out that the US has some hungry people, too. But these considerations are entirely besides the point. History shows that just because a nation or group of people can help, it doesn't mean that we do. My guess is that about a thousand national and international projects, organizations, and interests would come ahead of any donation of vegatable/cooking oil to Africa. One possible example of a higher priority (according to the resource owners') project would be the application of cooking/vegatable oil as energy source.
Since I'm in the US, a country that has a farm subsidy program that can lead to tax dollars being diverted to farmers to stop growing food (in order to keep prices up), then I'm ok with considering vegetable oil - or cooking oil if you prefer - as a possible solution. Anecdotal evidence available to me would indicate that it's at least viable for further evaulation.
But I'm still a fan of that whole 'oilgae' thing.