Which of the Following Is True of Conversation Analysis

Which of the following is true of conversation analysis?

A) It refers to the extent to which the conditions of an experiment adequately represent those of the world outside the boundaries of the experiment.
B) It is a unique approach to analyze quantitative data.
C) It refers to the extent to which the researcher can be confident that an experiment's stimulus actually produced the observed effect or whether something else caused the effect.
D) It focuses on the construction of reality as opposed to the discovery of reality.
E) Ethnomethodology grew out of conversation analysis.