Dhwanii
ElninoEffect, why not E because price for silver from neighboring state is going down right ? Option D - Where is it mentioned that silver has to be shipped what if its flying down via airplane or something
A circuits manufacturer in California needs a significant amount of pure silver for its wires. The manufacturer had two choices for a source of silver of this grade: a silver mine in a neighboring state or a silver distributor in East Asia. The latter was 30% less expensive when all costs, including transportation and related expenses, were included. The CEO of the manufacturer signed a long-term deal with the East Asian silver distributor, arguing that choice will save money over the course of the contract. This choice of the East Asian silver distributor is likely to prove more expensive than the silver mine in the neighboring state because ___________.
Which of the following most logically completes the passage?
A. the insurance rate for goods shipped over major oceans, especially a shipping route halfway around the globe, is considerably higher than the insurance for all forms of land-based shipping.
B. the pure silver needed for circuitry is typically much more expensive per ounce than the silver that appears in jewelry
C. the workers at the mine in the neighboring state are in a union that has recently gone on strike for higher wages and better working conditions
D. diesel, which should be used to fuel transcontinental supply ships per international regulations, was at an unusually low price during the time when this manufacturer modeled the costs.
E. as of last month, new refinement techniques have caused the price of domestic silver to reach new lows.
Hmmm. So we have a conflict.! I love conflicts help my grey cells to work.

Let's start with your first doubt:
why not E because price for silver from neighboring state is going down right ?You are saying since the price for silver from neighboring state is going down means the price of silver which we are importing from asia automatically should go up.!
Reversal technique. I like that. True
but by how much the price has gone down we don't know. From the question stem we know that the price of exported silver was 30% less than the price from the neighboring state. So, if the price has reduced by more than 30% we are golden but what if its not, i mean it has reduced but not by 30% then.? (we don't have a definite answer here) We can't choose it.
Now your second doubt.
Option D - Where is it mentioned that silver has to be shipped what if its flying down via airplane or somethingNow you are assuming things here but it's ok let's play along.
What we know from option D is that at the time when the manufacturer calculated the formula for the cost, at that time the price of diesel was
unusually low. (agreed.?)
Now you are saying what if the transportation was done through Airplanes (using ATF) and not through ships (using diesels) by the way both come under transportation cost.
Now to that, I can say what if both are interrelated as in since the price of diesel goes up more people will be using airplanes for transport and hence raising the price of the same so in short they are related.
Another example: If there are two kinds of transport and one transport goes on strike, the other will definitely benefit from it by raising the price.(Economics: monopoly)
So even though the manufacturer was not getting its silver shipped through ships the rise in the price of diesel will still have an effect.
I hope you are understanding what I am trying to say but you don't need to think this much because I already proved why option E is wrong so we are left with option D only but again I deep-dived into it just to explain and clear your doubt.