Despite legislation designed to stem the accumulation of plastic waste, the plastics industry continued to grow rapidly last year, as can be seen from the fact that sales of the resin that is the raw material for manufacturing plastics grew by 10 percent to $28 billion.In assessing the support provided by the evidence cited above for the statement that the plastics industry continued to grow, in addition to the information above it would be most useful to know:_________.
A. whether the resin has other uses besides the manufacture of plastics
B. the dollar amount of resin sales the year before last
C. the plastics industry's attitude toward the legislation concerning plastic waste
D. whether sales of all goods and services in the economy as a whole were increasing last year
E. what proportion of the plastics industry's output eventually contributes to the accumulation of plastic waste

The reason is that all the remaining evidences are quantitative but are not qualitative evidences. The reliable source of evidence is the one that doesn't require further investigation and in this situation the quantitative information was the 10% growth of manufacturing of resin which is used as a raw material in plastic manufacturing. This tells us that something might be going wrong as it is a speculation not an authentic statement against plastic industry. So further investigation is required to investigate whether this 10% increase in resin was solely or partially used in making plastic manufacturing or it has other uses as well. If it was used for manufacturing of other than plastic materials then well and good otherwise the relevant authorities must take actions against the plastic industry.

So the correct option is A.

Option B is again quantitative analysis.

Option C is objective analysis which talks about what are the ambitions of plastic industry related to plastic consumption which is just a theory in terms of law.

Option D is ambiguous statement because it doesn't relates to plastic industry.

Option E is impossible task to calculate the plastic wastage as a percentage of total wastage in the country.