Which statement accurately explains a scientific theory?

Which statement accurately explains a scientific theory?

A scientific theory explains why an event or observation happens and is supported with evidence.

A scientific theory explains why an event or observation happens but can not be supported with evidence.

A scientific theory describes the "what" for an event or observation and is supported with evidence.

A scientific theory describes the "what" for an event or observations but can not be supported with evidence.

A scientific theory explains why an event or observation happens and is supported with evidence.