Chose the correct relative pronouns in accordance with the sentence

The police identified the murderer ____ fingerprints were on the evidence.

The correct answer is: Whose

The correct answer is "Whose".
Here, we get two distinct sentence segments, namely "The police identified the murderer", and "The murderer's fingerprints were on the evidence". "The murderer" is the common portion which must be substituted for a relative pronoun to link the two parts. Among the given options, "Whose" is the most suitable alternative to show ownership of something (here, the fingerprints). So, the correct answer is "Whose".