If the vehicle shown in the image sees that you have signalled to overtake, may it facilitate the manoeuvre?

Why this is the correct answer

This question focuses on the obligations of the vehicle being overtaken, not on whether the overtaking itself should be attempted. Under Spanish traffic law, when the driver of the vehicle ahead notices that the vehicle behind has clearly signalled its intention to overtake (e.g. by activating the left indicator), they are obliged to move as close as possible to the right edge of the road to facilitate the manoeuvre. Additionally, the overtaken driver must not increase speed or perform any action that hinders the overtaking. If a dangerous situation arises once the overtaking has already begun (e.g. oncoming traffic), the overtaken driver is also obliged to reduce speed to help keep everyone safe. Important note: the image shows oncoming traffic, which might make you think the overtaking is unsafe. However, the question is not asking whether you should overtake -- it is asking whether the vehicle ahead may facilitate the manoeuvre. These are two separate issues in the regulations. The decision to overtake safely is the responsibility of the overtaking driver (who must check visibility, distance, and oncoming traffic before starting). The duty to facilitate belongs to the overtaken driver and is triggered when the overtaking intention is clearly signalled. That is why A is correct: the overtaken driver should help, but only when the overtaking driver has clearly signalled their intention.