The correct answer is: C. Either I or II follows.
The statement says that the availability of imported fruits has increased in the indigenous market and so the demand for indigenous fruits has been decreased. This means that indigenous fruits are now less competitive with imported fruits.
Course of action I says that the Government should impose high import duty on imported fruits. This would make imported fruits more expensive, which would make them less competitive with indigenous fruits. This would increase the demand for indigenous fruits.
Course of action II says that the fruit vendors should stop selling imported fruits. This would also make imported fruits less available, which would make them less competitive with indigenous fruits. This would also increase the demand for indigenous fruits.
Therefore, either course of action I or course of action II would help to increase the demand for indigenous fruits.