Question about Debate Scrum.

[wampirism]

In the Debate Scrum segment of Chapter 1, I got to the part where you have to press "B" on your controller to argue that Shuichi isn't the culprit against the opposing side. But the thing is: I don't play with a controller, I play with a keyboard, so I don't know which key to press during that part. Does anyone know which key would be the PC equivalent of the "B" button during that part? Thanks a lot.

EDIT: I managed to fix the issue by going into the settings console and setting up my keyboard as the control.