Two Research Assistants Trained to Code the Type of Interactions

Two research assistants trained to code the type of interactions observed between siblings, repeatedly disagree on how to code siblings' sarcastic comments toward one another. The resulting data may then be:

A) useless, as the coding system may be faulty
B) useful, as there is diversity in the observation
C) useful, and the consistent disagreement can be further studied
D) useless, as the information derived may be unreliable