Here are the best answers for each:
What is someone who is unimpeded not likely to face?
Barriers
Which event is a person most likely to perceive as interminable?
Boring lecture
Which of these individuals is in dire straits?
Hurricane victim
Who might look to a posse for help?
Sheriff or chief of police
Who relied on conquistadors?
King of Spain
The King of Spain relied on conquistadors during the Age of Exploration to expand his empire in the Americas.
These soldiers and explorers helped conquer territories and establish Spanish dominance in the New World, bringing back riches and resources to Spain.