Which of the Following Are Problems Associated with the Engle-Granger

Which of the following are problems associated with the Engle-Granger approach to modelling using cointegrated data?
(I) The coefficients in the cointegrating relationship are hard to calculate
(ii) This method requires the researcher to assume that one variable is the dependent variable and the others are independent variables
(iii) The Engle-Granger technique can only detect one cointegrating relationship
(iv) Engle-Granger does not allow the testing of hypotheses involving the actual cointegrating relationship.

A) (i) , (ii) , (iii) , and (iv)
B) (ii) , (iii) and (iv) only
C) (ii) , (iii) only
D) (ii) and (iv) only