Critical Reasoning

The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia. Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed. However, recent statistics show a droip in the number of television assemblers in Borodia. Therefore, updated trade statistics will probably indicate that the number of televisions Borodia imports annually from Vernland has increased.

Which of the following is an assumption on which the argument depends?

A. The number of television assemblers in Vernland has increased by at least as much as the number of television assemblers in Borodia has decreased.

B. Televisions assembled in Vernland have features that televisions assembled in Borodia do not have.

C. The average number of hours it takes a Borodian television assembler to assemble a television has not decreased significantly during the past three years.

D. The number of televisions assembled annually in Vernland has increased significantly during the past three years.

E. The difference between the hourly wage of television assemblers in Vernland and the hourly wage of television assemblers in Borodia is likely to decrease in the next few years


Here OA is C

What for then argument gives us so many things such as :

The average hourly wage of television assemblers in Vernland has long been significantly lower than that in neighboring Borodia. Since Borodia dropped all tariffs on Vernlandian televisions three years ago, the number of televisions sold annually in Borodia has not changed.

Is it merely to confuse !!
this is from GMATPrep

Well, I guess to confuse. What else!
I found that both (A) and (C) are probable answers. What made me decide on (C) was the following reasoning:
The conclusion is based on the "number" of television sets. (A) says about the assemblers , but not the television sets they produce. IF (C) were wrong, then Borodians would be producing more television sets. As (C) implies, Borodians are producing less TV sets.
Hence, answer is [spoiler](C).[/spoiler]

Guys can anyone give a decent reason why C is not right.