Write a question about the following article.

First generation biofuels are n't enough and second generation probably are n't either - plus they wo n't be ready . One can use oil shales and I was unhappy to see shale mentioned in the speech . Even with tax credits for cars wo n't change the fleet quickly - that will take a couple of decades .

Question:
What type of subject is the narrator interested in ?
Options:
A). They are interested in taxes .;
B). They are interested in consumption of energy .;
C). They are interested in sports fuel .;
D). None of the above choices .;