Rearrange the parts of the sentence in correct order.
It is a crisis which
P-unless policymakers
Q-exercise some intelligence
R-will get even worse

Let's trace the structural flow of the sentence:
The introductory statement is "It is a crisis which". This relative pronoun "which" refers to "crisis" and needs a corresponding predicate.

Part R ("will get even worse") acts as the direct continuation of the main clause ("It is a crisis which will get even worse...").

Following this, we need a conditional structure. Part P introduces the condition ("unless policymakers").

Part Q provides the verb phrase that finishes the conditional clause ("exercise some intelligence").

Combining them gives: "It is a crisis which will get even worse unless policymakers exercise some intelligence."

Thus, the correct sequence is RPQ.