People ( ) a general understanding of the water problem.(A) lack of (B) are lacking of (C) lack (D) are in lack

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People ( ) a general understanding of the water problem.(A) lack of (B) are lacking of (C) lack (D) are in lack
People ( ) a general understanding of the water problem.
(A) lack of
(B) are lacking of
(C) lack
(D) are in lack

People ( ) a general understanding of the water problem.(A) lack of (B) are lacking of (C) lack (D) are in lack
C