I would go with E.
Although the Alma is a foreign car, it is made in the US. It is a special case where the rule of buying a foreign car does not apply
I would go for C.
IMO, E is out-of-scope, since Harry never agrees that Alma Deluxe is an import car. He just agrees that Alma is a foreign company. Discussion is about the car and not the car company.
If Harry had agreed that Alma Deluxe is an import car and still gave some reason to defend his decision, then we can consider it as an exception.