A student is writing a research report claiming that polygraph tests are valuable for detecting when someone is lying. She found two sources. Read the sources and answer the question that follows.
Source 1:
A polygraph, or lie detector, test measures physical activity such as respiration and heart rate. When people lie and are aware they are lying, their bodies may react in a physical way that is not easily detected by the human eye. This is especially true if they are afraid of being found out. Polygraph tests are useful for detecting these physical changes and signaling that the person being tested is not being truthful.
Source 2:
A polygraph test, also called a lie detector test, does not detect lies. It measures physical reactions connected with fear and anxiety. Because there are other reasons people can feel anxious when being questioned, it is impossible to learn anything from these tests.
Which source information best supports the student's claim?
Answer choices for the above question
A. From Source 1: "A polygraph, or lie detector, test measures physical activity such as respiration and heart rate."
B. From Source 1: "Polygraph tests are useful for detecting these physical changes and signaling that the person being tested is not being truthful."
C. From Source 2: "A polygraph test, also called a lie detector test, does not detect lies."
D. From Source 2: "Because there are other reasons people can feel anxious when being questioned, it is impossible to learn anything from these tests."