What is especially important when choosing the speed for driving along tree-lined avenues with narrow roadways?

You answered correctly because both points 1 and 2 are essential for safe driving on narrow, tree-lined avenues. It is important to simultaneously estimate the lateral distance to the trees and any oncoming vehicles to avoid collisions. Additionally, since the roadway is narrow, you must be prepared to stop within half the visible distance if a wide vehicle approaches from the opposite direction, allowing enough space and time to avoid accidents. Point 3 is incorrect because rapidly changing light conditions actually make it harder, not easier, to judge distances, so it is not a helpful guideline for choosing speed in this context. Always adjust your speed to ensure safe stopping distances and careful lateral positioning in such environments.