Answer: c. Cement is very heavy, and the cost of shipping is measured by weight
Step-by-step explanation:
The Law of One price is that prices of a good should be the same regardless of where they are being sold in the world after accounting for currency rate conversion.
Cement might be tough to this.
Because of the high transportation cost, it would be difficult to charge the same price across nations because the of the high transport costs that needs to be employed need to be covered.