E.L Ullman, Who identified certain basic factors affecting interaction between regions. Consider the following statements-

A. There must be a demand in one region that can be met from another region.

B. The area of demand must be able to pay for the supply so that a two way movements develops.

C. The movements will only take place if each region is self sufficient.

D. Interaction between the regions will only take place if there are no intervening opportunities.

E. Interaction between the regions will only take place if the product can be moved.

Choose the correct answer from the options given below: