Which of the Following Research Designs Involves Ethnographic Research

Which of the following research designs involves ethnographic research?

A) Measuring the increase in test scores on the state reading test when dyslexic children have additional time to take the test
B) Collecting data about the inclusion of a child with vision impairment by conducting interviews with a vision impaired child,his parents,his teachers,and his peers
C) Changing teaching strategies to see whether the new strategy brings about more learning in the math unit about adding fractions
D) Following a group of Hmong students who attend a public elementary school in Minneapolis to understand their acculturation at school