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(A) Native Americans, intimately knowing the ecology of the land, were a help in the rescuing of - no relative pronoun/ passive (B) Native Americans knew the ecology and the land intimately and this enabled them to help in the rescue of - to help in the rescue of - passive (C) Native Americans, with their intimate knowledge of the ecology of the land, helped to rescue - correct (D) having intimate knowledge of the ecology of the land, Native Americans helped the rescue of helped the rescue of - passive (E) knowing intimately the ecology of the land, Native Americans helped to rescue no relative pronoun