Face-to-face communication can be an effective conflict resolution strategy when two people's tempers are flaring?

he answer is no

In face-to-face communication it is transcendental to choose words politely, so that they do not make reality worse. Most confrontational messages are affirmations of the type you did, and only tend to increase conflict. In other words, the messages of "you" blame, shame, accuse, threaten, rule, denigrate ... The messages of "you" tend to evoke resentment, hatred and revenge.

What is decisive in all face-to-face interaction, then, is the constancy in defining ourselves by positioning ourselves in relation to the concrete situation in which we find ourselves immersed in everyday life.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.