Many consumers are concerned about the ecological effects of

Situation: Stores are stocking new cleaning products that have been produced in a concentrated form. The concentrated form is packaged in smaller containers that use less plastic and require less transportation space.
Explanation: Many consumers are concerned about the ecological effects of wasteful packaging.

The argument tries to explain the current situation in which the stores are stocking concentrated products by reasoning that consumers are concerned about effects of wasteful packaging.

Question: Which of the following, if true, most seriously undermines the explanation offered above?

We need to find an option that undermines this explanation. Something that tells us that the stores may be stocking concentrated products for some other reason, not because consumers are concerned about effects of wasteful packaging.

(A) Few consumers believe that containers of concentrated cleaning products are merely small packages of regular cleaning products.

It is good for our explanation that few (which basically means none or very very less) consumers believe that containers of concentrated cleaning products are merely small packages of regular cleaning products. If many consumers thought that containers of concentrated cleaning products are merely small packages of regular cleaning products, they would want these small packages. It would be ecologically wasteful. Because they believe that these packages are concentrated and not just regular product, they know that the actual content in each small package is far more. One can dilute it and get a lot more of the regular product from this small package. Hence, instead of packaging regular product in big containers, packing concentrated product in small containers is more ecologically friendly.
Hence, this option does not undermine our explanation.

(B) The containers in which concentrated cleaning products are packaged are no harder to recycle than those in which regular cleaning products are packaged.

Again, it is good for our explanation that these concentrated product packages can be recycled easily too. Consumers would want it then.

(C) Those concentrated cleaning products that are intended to be used diluted have clear instructions for dilution printed on their labels.

Irrelevant.

(D) The smaller containers of concentrated cleaning products enable supermarkets and drugstores to increase their revenues from a given shelf space.

This is an alternative explanation for why stores are stocking concentrated product. Not because consumers are worried about ecological impact but because they can increase revenue from their available shelf space by stocking smaller containers.
Hence it undermines the explanation provided by the argument.

(E) Consumer pressure has led to the elimination of wasteful cardboard packaging that was used for compact discs.

Irrelevant. If anything, it would make it more likely that consumer pressure against wasteful packaging has an impact.

Answer (D)

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