Final answer:
The most effective strategy is conducting research on cultural norms prior to visiting another country.
Step-by-step explanation:
The most effective strategy for ensuring competent intercultural communication prior to visiting another country is option D) Prior to visiting the country, you should conduct research on the cultural norms by visiting the U.S. State Department website.
By conducting research on the cultural norms of the host country, you can familiarize yourself with their customs, traditions, and appropriate behavior. This will help you avoid misunderstandings and navigate the new cultural environment more effectively.
For example, if you are visiting a country where bowing is customary as a sign of respect, knowing this beforehand will allow you to adapt your behavior and show proper respect.