[問題] 句中的in place that是什麼意思?

[minhonez (minhonez)]

On September 5th Angola had its first election with a new quota ______ that says 30% of candidates must be women.

(A) in place
(B) in use
(C) in rue
(D) in contrast

答案是A，為什麼??
且其它選項翻起來是什麼意思?

煩請高手解惑!!

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