Answer:
all of them carry important values
Explanation:
trade is applicable for all scenarios. we all have problem at least in our life and we need others support so above mentioned scenarios are not redundancy trading.
B. The Wright brothers . . .

The 2020 presidential election has been a disaster for people who think the Electoral College is still a good idea. Joe Biden’s clear victory has been followed by attempts by the incumbent president to induce Republican legislators and other elected Republican officials in five states he lost to ignore the certified vote counts in their states and substitute their partisan preferences for the voters’ decision. Now Congress will formally receive the electoral votes, after a series of attempts to subvert the democratic process, all made possible by the Electoral College.
16th- February 13, 1913
17th- April 8, 1913