The answer to your question would be B. This is because GM stands for genetically modified, which means it is not natural. And that is why people prefer organic food if they can afford it, because they don't want to eat food that is not natural. Hope this helps! :D Feel free to ask more questions.
The word you're looking for is waning. When the moon's illumination is increasing, it is waxing.
Gold is plentiful in Africa and is a necessity for most technological devices.