The rank order of groups to whom professional engineers have ethical responsibilities from greatest to least is:.

1. society as a whole,

2. the client,

3. the profession,

4. oneself

Explanation:

Given that the work of Engineers has to do with infrastructures that affect everybody in society. From the construction of housing to bridges, roads, and highway engineering, etc. The rank order of groups to whom professional engineers have ethical responsibilities from greatest to least is the following:

1. society as a whole: because the outcome of the construction project affects people in society. Hence, they come first especially in terms of rules, regulations, and safety of the public

2. the client: the owner is the financier of the project. Hence, his decision is also paramount but comes second.

3. the profession: because the engineer is an ambassador of the profession. Hence, he should protect their rules and regulations

4. oneself: then engineers should also consider his own gain in the course of discharging the work of the client

just don't strip down in public lol