23 Which of the following impacts of harmonized import tariffs is correct?
(A)The framework of harmonized import tariffs needs not to be further examined.
(B)Since the launch of harmonized import tariffs, import trade with other countries has increased.
(C)The introduction of harmonized import tariffs did not affect the customs union as much as anticipated.
(D)The harmonized import tariffs resulted in the removal of internal border controls among the three countries.