GRE General Test: SE-522867 GRE Sentence Equivalence

When the town’s water supply ran low during the summer drought, the residents received a notice that _____ them to take heed of the dearth of water and avoid any water-related activities that weren’t necessary.
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning