Option 4: His polices have already reduced inflation by more than 10 percent.
The President Carter's statement of having reduced inflation by more than 10 percent function as a claim because it is used as a primary point to support and prove the effectiveness of his policies and the benefit that it represents when improving American economy so it can be accepted by the public.
Because the demand has gone up too, the bikes should gain more profit. Eventually there will be too many bikes produced and their value will drop.
I think its D, they would be able to ship livestock via railroad