问LSAT 1-4-13 B. (原题已经copy)

13.That gadget I bought for the kitchen last week has already broken. It is just another example of the shoddy products that we are seeing more and more of these days. The thing was probably manufactured in East Golo.

Wich one of the flowing is the best expression of an unstated premise that underlies the author's reasoning in the passage?

(a) If a manufacurer uses shoddy materials to make a gadget, the gadget is likely to break quickly.
(b) If a gadget breaks quickly, it was probably manufactured in the East Golo.

a是正确答案。但b错在哪里呢。谢谢指教。

Option b is the key. "shoddy materials" is a new conception which i can't find in the stimulus.