Labour standards facilitate international trade and there are international regulations to secure this. Is this statement TRUE?

Labour standards facilitate international trade and there are international regulations to secure this. Is this statement TRUE?
A . yes- labour standards are regulated by the UN and other multi-national bodies
B. yes- there is a minimum labour standard governing pay and conditions
C. no- labour standards vary from country to country
D. no- no countries have established labour standards

Answer: C

Explanation:

3 is correct. To work this out, firstly decide if the answer is yes or no. The answer here is no- there are no international regulations on labour standards. Therefore options 1 and 2 are incorrect. Out of 3 and 4, we know that 4 is incorrect because some countries do have labour standards (e.g. the UK has a minimum wage). Therefore by process of elimination option 3 is correct. This is from p.57 of the study guide