单选题：How did Freling feel when he first planned solar chip irrig

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题目内容：
How did Freling feel when he first planned solar chip irrigation systems for Benin? A．He was optimistic about the future.
B．He was very excited about the prospect.
C．He didn't know whether it would be feasible or not.
D．He was only worried that the technology was not economical yet.

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