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Japan"s 24-hour convenience stores， already struggling with lagging sales and growth， may soon face yet another threat——moves to limit business hours and close the stores late at night. The prefecture of Saitama， which borders Tokyo， may follow in the footsteps of the western city of Kyoto and urge convenience stores to close during late night hours in an effort to limit carbon dioxide emissions.
Kyoto， a former capital， wants to persuade convenience and other 24-hour stores to close late at night so as to improve evening views of the city and cut down on energy use. The Nikkei said closures could last from 11 p.m. to 7 a.m. The move is strongly opposed by the industry， which fears a withering impact on an already troubled sector also grappling with the. specter of a higher tobacco tax， which could hit overall sales.
"Even if we only operate the stores for 16 hours， we can"t stop the refrigerators，" said Toshiro Yamaguchi， the president of Seven-Eleven Japan Co. He said such cuts in operating hours wouldreduce each store"s profit by 20 percent. "If this happens， our current business model will lose its foundation. "
Analysts said that while it is difficult to estimate the potential impact of the move without a concrete plan， their overall impression was that it was likely to be negative. "This could cut profits and lead to less efficient operations and the increased loss of opportunities，" said Masafumi Shoda， an analyst. " But it depends on the store——urban stores do better than others. There are some in the countryside that are inefficient. ""
Which Japanese city was the first to try to limit convenience store hours？ 查看材料

A. Saitama.
B. Tokyo.
C. Kyoto.
D. Nagoya.