Question

how do the montague and capulet families contribute to the catastrophe in romeo and juliet?
by carrying on a violent feud
by discovering the secret marriage
by challenging the prince
by intercepting friar johns letter

Explanation:

In "Romeo and Juliet", the Montague and Capulet families have a long - standing, violent feud. This feud creates a hostile environment where Romeo (Montague) and Juliet (Capulet) cannot be together openly. Their secret marriage and the subsequent events are all exacerbated by the ongoing feud between the two families. Discovering the secret marriage is not the main contribution to the catastrophe, challenging the prince is not a key action of the families related to the catastrophe, and intercepting Friar John's letter is done by external factors, not the two families. So the correct reason is that they carry on a violent feud.

Answer:

A. by carrying on a violent feud