Sunita Williams is an American astronaut of Indian origin who has participated in multiple space missions conducted by NASA.
One of her most notable achievements was setting a record for the longest single spaceflight by a woman at that time. During her mission aboard the International Space Station (ISS), she remained in space for approximately \(195\) days.
This achievement brought her international recognition and inspired many students interested in science and space exploration.
Among the given options, the value that correctly represents her well-known duration in space is:
\[
\boxed{195\ \text{days}}
\]
Therefore, the correct answer is
\[
\boxed{(B)}
\]