A is the answer I believe
France was on the verge of a general election and would not act without Britain’s support. Britain felt that the Treaty of Versailles was unfair and harsh on Germany, so they decided not to tale any action. As a result of this, so did France.
Johnson announced that he would not run for a reelection, and that's when Humphrey decided to run, launching his campaign for presidency right after. Considering that he was loyal to Johnson's administration policies considering the Vietnam War, his own party disliked the idea of him running and they opposed to it, since they disagreed on how Johnson was dealing with it all.
i think it's the patriarch, sorry it's so late. but this will help other people.
:)