The idea of "getting" a joke, according to the text, depends on:

The indication of getting a joke that is conferring to the text is subject to understanding the two realities involved and appreciating their difference. In addition, beholding at humor from a structural-functional viewpoint, jokes are frequently used to release tension lightening a condition. As of a social-conflict point of view, jokes can be a method of creating one class of people feel upright at the expense of another.

The correct answer is "  it was believed that the dispute emerged in 632 just after the death of the prophet muhammad."