What is true here regarding the distance between you and the vehicle ahead?

You answered correctly. The safe distance to the truck ahead is appropriate because the yellow car might re-enter your lane in front of you after overtaking. After the yellow car has pulled back, you must restore a sufficient distance to that car as well. Maintaining proper following distances is important for reaction time and safety, especially when vehicles in neighboring lanes may merge back in. Always ensure your gap allows for safe braking and changes in traffic situations. The answer about the truck being “too large” is not relevant to the safe distance rule.