I think it should be because diplomats is the representative of a nation and negotiating with other nations could be more easier if we're already friendly with the diplomat. Also the way we treat their diplomat is also the way of how we treat the nation he/she representing and it would add a good standing in the global status if we are respecting the diplomats.
The phenomenon that triangular trade most directly encouraged was slavery. The first part of the triangle was the crossing of the Atlantic Ocean by Europeans wishing to sell their products. With the money obtained the europeans would buy slaves; sometimes they would just trade the products they brought directly for slaves. The same european ships would then sail to America to sell the slaves as plantation labourers. With the money obtained the europeans bought raw products like cotton and took them to Europe for further processing. The complete cycle took like a year.
Answer: The first 2
the independent id the variable which is changed
the dependent variable is the variable which is observed a result of the change.
Explanation: