Despite a general decline in sales of other eco-friendly vehicles, the EcoDrive is experiencing a surge in popularity. The manufacturers of the EcoDrive claim that this success is due to its competitive pricing and exceptional fuel efficiency. However, since the EcoDrive's price and fuel efficiency are similar to those of its rivals, it is more plausible that its popularity stems from consumers' desire to be seen as environmentally responsible by their peers. Which one of the following is an assumption required by the argument?

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This one seems pretty clear. The argument says the EcoDrive's popularity is due to wanting to be seen as eco-responsible, so it must be that the car is seen as more eco-friendly than others. That's exactly what B says.

Why not A? The argument says price is similar, so affordability isn't the reason. But could it be that it's the most affordable? No, because they said price is similar to rivals. So A is out.

I was stuck between B and E. E says owners are less concerned about environmental issues, but that would mean they don't care, so why would they want to be seen as eco-responsible? Actually, it might support the argument? Hmm, but it's not necessary. B is definitely needed.