199. Popular interest in music performed by folk singer Jean Ritchie acted as a ______ because it ______ a wider interest in the music of Ritchie's native Kentucky.
A. deterrent, launched
B. panacea, overcame
C. barrier, awakened
D. catalyst, stirred
E. provocation, mitigated

200. Oceanographers have identified more than 50 "dead zones" around the world: areas of sea that various forms of pollution have rendered ______ life.
A. conducive to
B. invaluable to
C. imperative to
D. indistinguishable from
E. bereft of

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