Answer:
I'm not too sure if this is correct but I'll say it would be
"Among the 40 members of Greenville School's Archery Club, she was the only one who could hit a target 50 meters away."
and
"During the second term, a new student, Ripley, joined the archery club."
Explanation: The reason that I say this, is because I would think that "Gradually, Ripley took over Ellie's position as the top archer of the school." would be the climax or the problem and usually the rising action takes place before the climax and these were the only 2 options before that.
I AM VERY SORRY IF IT IS WRONG
Edit: IT IS WRONG SORRRRRRRYy