Change the following sentence into its passive form:
Clues at the murder scenes led them to a suspect's apartment.
1
A suspect's apartment was led them by clues at the murder scenes.
2
They have been led to a suspect's apartment by clues at the murder scenes.
3
They were led to a suspect's apartment by clues at the murder scenes.
4
They are led to to a suspect's apartment by clues at the murder scenes.