The correct response regarding a consequence of the Gulf Stream becoming weaker is:
It will result in warmer temperatures in Europe.
If the Gulf Stream weakens, it would reduce the transport of warm water to the North Atlantic and Europe, potentially leading to cooler temperatures in those regions, rather than warmer temperatures. Therefore, the response provided seems incorrect. If you intend to emphasize the consequences of a weakening Gulf Stream, the implication is typically cooler temperatures in Europe. However, based on your response options, the best fit considering the possible misleading implications is:
It will result in more powerful Atlantic hurricanes.
This statement may relate to changes in ocean temperature and climate conditions, which can influence hurricane intensity. But it's important to verify the primary consequences are indeed problematic cooling in Europe and broader climatic changes.