What does the author imply by "Until now such bonds have largely been the preserve of rich-country is-suers" ( Line 3-4, Para.2) ?( )
A、[A] The catastrophe bonds are mainly reserved by rich countries.
B、[B] Only rich countries have the ability to issue the catastrophe bonds.
C、[C] Rich countries seldom issue the catastrophe bonds.
D、[D] Most of the catastrophe bonds are raised in rich countries.
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