Which of the following can cause tree damage while snowmobiling?

Cutting turns too close to trees is the correct answer because this behavior increases the risk of collision with the trees, which can lead to physical damage to the trees. When snowmobilers take sharp turns near wooded areas, they may inadvertently scrape or collide with tree trunks, branches, or other vegetation. This not only risks damaging the trees but can also potentially lead to accidents and injuries for the snowmobiler.

Additionally, while excessive speed can lead to accidents and riding at night poses visibility issues, these factors don’t directly impact the trees themselves in the same way that getting too close to them does. Driving on thick snow, while it may affect the snowmobiler's maneuverability, also doesn't cause tree damage. Thus, cutting turns too close directly relates to the potential for harming trees, making it the most relevant answer.