The argument is a prediction made by Consumer Advocates, stating that the book won't increase consumption of products containing recycled materials and we are asked to support this "justify".

The evidence used to support the argument is that:
1. Consumers are committed to using recycled material products
2. The book that is to be published by the Govn't contains a comprehensive listing of products containing such recycled materials.

POE
A is incorrect because the book covers this. Even if the labels don't contain information about whether the recycled materials are inside of them, consumers will still be able to identify goods that contain such recycled materials

B is correct because it indicates that consumers, who are in fact committed to using recycled materials, are already enacting the plan by purchasing goods that already contain recycled materials

C is incorrect because the motives of manufacturer's in producing the recycled materials is not conducive to whether the plan will succeed

D is incorrect because the book does not differentiate between new or existing brands, and the fact that new brands will be at a disadvantage does not indicate why the plan won't be successful per prediction.

E is incorrect because the composition is irrelevant. Unless we are explicitly told "consumers only buy recycled products that list out the composition of each product" then this information is useless.

Answer: B