Typically, ghost hunters will begin by traveling to a location that is __(4) believed to be haunted they will research__ the history of the location and interview witnesses. From there, they will conduct their own investigation. A team of investigators will search the premises for clues.
The underlined portion can be corrected by all of the following options EXCEPT:
a) believed to be haunted. They will research
b) believed to be haunted; they will research
c) believed to be haunted, where they will research
d) believed to be haunted and they will research