Direction: In each of the questions, a sentence is given which has an underlined part. Select the best replacement for the underlined phrase from the given options.
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So fragile are glass frogs, with skin so thin their organs are visible, Kubicki attributes their survival to a healthy Costa Rican ecosystem that allows less-hardy creatures to flourish.
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- So fragile are glass frogs,
- For the reason glass frogs are so fragile,
- Because of the reason glass frogs are very fragile,
- Because glass frogs are so fragile,
Correct Option: D
