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The correct answer to the question is:
D) Presumptive test
Here's an explanation to help you understand why:
1. A presumptive test is an initial screening test conducted by crime scene investigators to determine the class of evidence.
2. This type of test is used to provide quick and preliminary results to indicate the possible presence of a substance.
3. It helps investigators narrow down the focus of their analysis and determine if further confirmatory testing is needed.
By conducting a presumptive test, investigators can quickly gather crucial information about the evidence found at a crime scene before proceeding with more in-depth analysis.