World war 2 is the answer
The answer is: Trust
Non-profit organizations were established to fight for a common good rather than for profit.
This mean that when more than one nonprofit organizations work together, they tend to skipped various costly legal formalities that usually made to protect organization's interest and not lose its profit. Because they overlook this, they need to build a foundation of trust in their relationship.
Response bias goes toward the 3rd one and question wording goes to the 2nd
