An artificial hormone has recently been developed that increases milk production in cows.
Conclusion (should = opinion)
The proposal to require milk labels to detail what artificial substances were used to make the milk should not be implemented.
Evidence (colon)
Just imagine trying to list every synthetic fertilizer used to grow the grass and grain the cows ate, or every fungicide used to keep the grain from spoiling.
Evaluate
On Method, we ultimately just need to pick an answer with a true description, but we can benefit by being aware of the 8 options these questions usually come down to:
- analogies - (counter)example to general claim - ruling out other options - suggesting alternative explanations - troublesome implications - definitions / distinctions - raising an overlooked consideration - calling out a dubious assumption
Here, it seems like the author was doing the "troublesome implications" move. This either takes the form of arguing, or it takes the form we're seeing here, where someone talks through the implications of a plan / recommendation.
Our author is saying that if milk producers were required to talk about all artificial substances used in milk production, that would have absurd / untenable / unacceptable consequences, such as having to list the fertilizer used to grow the grass the cows ate or the fungicide used to keep the grain from spoiling.
Goal
Look for something like,