Answer:
D). Restrictions on the use of water would continue because no appreciable increase in the level of the river had .
Step-by-step explanation:
As per the question, option D i.e. 'restrictions on the use of water would continue because no appreciable increase in the level of the river had ' exemplifies the sentence that most appropriately revises the underlined sentence as it is grammatically and semantically coherent. The other options either contains an awkward usage of word('appreciative' in option A, B) or passive voice misuse(option C) or the inappropriate use of being(in option E). Thus, option D is syntactically and semantically appropriate.