It seems that the drop-down menu you're referring to is not available in this text format. However, I can help you construct a potential completion for the sentence based on common knowledge about Venezuela's economic institutions.
A possible completion could be:
"Venezuela’s economic institutions differ from those of other nations in the region mainly because Venezuela has a heavily centralized and state-controlled economy, particularly in the oil sector, which contrasts with the more market-oriented approaches of many neighboring countries."
If you provide me with the specific options in the drop-down menu, I can assist you further in selecting the most appropriate one!