How many reactors are there in Japan?

The correct answer indicates that Japan has three reactors currently operational or functioning. This number reflects the situation as of a specific point in time, acknowledging that Japan has faced significant changes in its nuclear energy landscape, especially following the events at Fukushima in 2011. The country had many reactors prior to this incident, but many were subsequently shut down due to safety concerns and regulatory overhauls.

Understanding the context surrounding the number of reactors is crucial. Even though Japan may have had more reactors in the past or may be undertaking efforts to restart others, focusing on the present count is essential for accurately answering the question. The other choices imply different numbers, but only three represents the current operational status effectively.