Select the option that makes the correct use of “unsustainable”, as used in the passage, to fill in the blank space. 
a) In the long run, the ______ officials followed emergency procedures. 
b) Emergency procedures were _______ by the officials. 
c) Officials reported an ________ set of events during the emergency. 
d) Officials admit that the emergency system is _______ in the longer run.
d) Officials admit that the emergency system is _______ in the longer run.
Explanation:
d) Officials admit that the emergency system is unsustainable in the longer run.
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