中国（SC121（巻末））

中国（巻末−121）からの問題です。

(Severe increasing numerous are pointing to deficiencies in the British legal system, deficuencies that seem) to deny a proper defense to many clients who are charged with crimes.

A)Severe increasing numerous are pointing to deficiencies in the British legal system, deficuencies that seem

B)Severe increasing numerous point to deficiencies in the British legal system, deficuencies that seeming

C)Severe increasing numerous are pointing to deficiencies in the British legal system that seem

D)Severely increasing numerous point to deficiencies in the British legal system seeming

E)Severely increasing numerous are pointing to deficiencies in the British legal system that seem

答えが（C)なのですがなぜでしょうか？
that seem が deficiencies に関係代名詞句として修飾しているからと考えてもいいのでしょうか？その場合、先行詞が直前にないことになりますが・・・。

宜しくお願い致します。