The second walk-through includes collecting evidence in the room where the corpse was found. the purpose of this process is to
a. identify the victims and establish a motive for the crime
b. develop control evidence which can be used to identify the suspect
c. use the evidence to identify links which will eventually reconstruct how the person died in such a way that it will stand up in court
d. establish links which will identify the suspect

c.

Explanation:

According to my research on crime scene investigations, I can say that based on the information provided within the question this is done in order to use the evidence to identify links which will eventually help reconstruct how the person died in such a way that it will stand up in court. Which the evidence is also studied in order to use those links to find suspects and link them to the crime and hopefully solve the crime.

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