the OA is B , i have googled the OA.
Thanks. B indeed makes more sense than the rest.
Twenty years ago the Republic of Rosinia produced nearly 100 million tons of potatoes, but last year the harvest barely reached 60 million tons. Agricultural researchers, who have failed to develop new higher yielding strains of potatoes, are to blame for this decrease, since they have been concerned only with their own research and not with the needs of Rosinia.
Which one of the following is an assumption on which the argument depends?
(A) Any current attempts by agricultural researchers to develop higher-yielding potato strains are futile.
Not correct. If this were correct, author would have said the researchers are incompetent or something on those lines. Author's complain is that researchers are not putting effort in the right direction.
(B) Strains of potatoes most commonly grown in Rosinia could not have produced the yields last year that they once did.
Author indeed assumes this as he thinks there is a dire necessity of developing higher-yielding potato strain, for the strain that produced 100M tons 20 years back can't produce the same yield anymore.
(C) Agricultural researchers often find concrete solutions to practical problems when investigating seemingly unrelated questions.
Agricultural researchers often find concrete solutions to practical problems--- this part is good.
When investigating seemingly unrelated questions- what does this condition imply? I didn't fully understand the context and the condition.
I want to know whether they find concrete solution to any practical problem that relates agriculture.
(D) Wide fluctuations in the size of the potato crop over a twenty-year period are not unusual.
Opposite of what Author may have assumed. Author seems infuriated with this fluctuation or decline. No way can she thinks that the fluctuations are usual.
(E) Agricultural research in Rosinia is funded by government grants.
Agricultural research in Rosinia is funded -- acceptable.
Agricultural research in Rosinia is funded by government grants-- maybe/may not be.