Which of the Following Is FALSE

Which of the following is FALSE?

A) Different studies have used different measures of pain, making it difficult to compare across studies.
B) There has not been any research on the experience of pain among ethnic groups other than African Americans or European Americans.
C) Some of the ethnic differences in pain among different ethnic groups may be due to ethnic identity.
D) A number of studies have failed to find significant cultural differences in pain perceptions.