Can we draw the following hypothesis from the context (see options)? 

Context:

FRANKFURT (Reuters) - Swedish carmaker Volvo is preparing a hardware retrofit for some of its older diesel cars in Germany, according to a report by Der Spiegel magazine published on Monday. Volvo is working on the retrofit with catalyst producer Dr. Pley, which is based in Bamberg, Germany, it added.

Hypothesis: Most of Volvo's diesel cars were produced in Bamberg, Germany. 
Select from:
 a). Yes
 b). It's impossible to say
 c). No
b).