Final answer:
Sebastian's assignment of responsibility for the argument between Mark and the professor in an economics class is subjective and depends on his perspective and biases. Without additional context, it is not possible to determine who he would say is more responsible.
Step-by-step explanation:
When considering who Sebastian might say is more responsible for the argument between Mark and the professor in an economics class, it depends entirely on Sebastian's perspective, personal biases, and the specific interactions that occurred during the argument. It's important to consider that there may be underlying dynamics at play, such as a possible history between the professor and Mark, the nature of the disagreement, and Sebastian's relationship with both parties. As such, a precise answer cannot be provided without more context about the argument and Sebastian's point of view. However, given no additional information, one could speculate using common social dynamics or biases that could influence Sebastian's opinion on the situation. These might include tendencies to support peers over authority figures, or vice versa, and the behavior of each party during the argument.