What George McGovern experienced in 1972 and Jimmy Carter in 1976 under the new rules showed that a. it threatened other party goals such as winning and governing and outsiders with tenuous links to others in the party could compete.
The new rules governing how people could run under political parties meant that it was easier to open up the floor to candidates that did not have much links to the parties they ran under.
This allowed outsiders like George McGovern and Jimmy Carter to gain the presidential candidacy in their respective parties even though they were not staunch party members.
Having someone with tenuous links to the party meant that the party could not enforce its will over the candidate or get goals accomplished that the candidate was not in support of.
In conclusion, option A is correct.
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