Final answer:
The culture clash reaches its full height in the magnify differences stage of an M&A situation.
Step-by-step explanation:
The culture clash reaches its full height in the second stage, which is magnify differences. In this stage, the differences between the cultures involved in an M&A situation are amplified and exaggerated, potentially leading to conflict and tension. The magnification of differences can occur due to misunderstandings, miscommunication, or a lack of appreciation for the other culture's norms and values.