I’m pretty sure that is independent
It is A. I googled all of them and A is the only one that didn't have stories written about it.
Churchill and Stalin became allies
Nixon stepped down in 1974, halfway through his second term, rather than face impeachment over his efforts to cover up illegal activities by members of his administration in the Watergate scandal.
B and a little of c because he wanted people to be able to say goodbye to their temporary leader
