In 1994 agreements existed between Canada and several countries in Europe, agreements that allowed any car authorized in one participating country to be sold in any of the others.
A. existed between Canada and several countries in Europe, agreements that allowed any car authorized in one
B. had existed between Canada and several countries in Europe, agreements that allowed any car authorized in one
C. existed among Canada and several countries in Europe, which allowed any car authorized in one
D. had existed between Canada and several countries in Europe, which allowed any car authorized in one
E. existed between Canada or several countries in Europe, agreements that allowed any car authorized in that
I want to understand why is the use of had existed incorrect since it talks about 2 events in the past. first the agreement and second the authorization of sales
A. existed between Canada and several countries in Europe, agreements that allowed any car authorized in one
B. had existed between Canada and several countries in Europe, agreements that allowed any car authorized in one
C. existed among Canada and several countries in Europe, which allowed any car authorized in one
D. had existed between Canada and several countries in Europe, which allowed any car authorized in one
E. existed between Canada or several countries in Europe, agreements that allowed any car authorized in that
I want to understand why is the use of had existed incorrect since it talks about 2 events in the past. first the agreement and second the authorization of sales
