The following assumptions indicate the weaknesses of the Heckscher-Ohlin Theory:

• There is free trade between the trading countries.
• There is incomplete specialization in the production in both countries.
• There is constant returns to scale in the production of both commodities.
• There is perfect competition in the commodities and the factor markets in both countries.

The Heckscher-Ohlin Theory assumes that demand preferences are the same (not different) in both countries. The correct answer is B.