Which of the Following Would Be an Example of a Microaggression

Which of the following would be an example of a microaggression?

A) asking an Asian American for directions
B) telling an Asian American that they "speak good English"
C) telling a Hispanic American that "they should lighten up" rather than be offended at a racist joke
D) telling a Native American that they are making a "mountain out of a molehill" when they disapprove of a white person dressing up as a Native American for Halloween