问题：
[阅读理解] 29. We learn from the last two paragraphs that business-method patents
[A] are immune to legal challenges.
[B] are often unnecessarily issued.
[C] lower the esteem for patent holders.
[D] increase the incidence of risks.
[阅读理解] 29. We learn from the last two paragraphs that business-method patents
[A] are immune to legal challenges.
[B] are often unnecessarily issued.
[C] lower the esteem for patent holders.
[D] increase the incidence of risks.
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