It would be ethical for Joe Martin, the Chief Design Engineer, to be unconcerned that the design specifications set by management for the new plant have safety standards that are well below those for similar plants in his home country.

It would not be ethical.

Explanation:

The chief engineer of a project must always appreciate that project specifications promote the highest level of safety for his workers. This is because low safety standards can compromise the health (harming them to a great extent) and the lives of workers.

For this reason, it would be unethical if Joe Martin allowed the project to be established with safety guidelines below the mandatory safety guidelines in his home country. Joe should demand that safety standards be as efficient as possible.

i think it is the third one.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )