Wind is a bit like airflow over a wing - as you get closer to the surface, you get into a boundary layer situation where the wind velocity reduces. For met you may also see a bit of change in direction but the main ask here is the reduction in speed.

There are various mathematical models around the place but the one we use routinely in flight test work is referred to as the 1/7th power law -

(ws1/ws2) = (h1/h2)^(1/7)

where ws is wind speed, h is height about the ground, and 1 and 2 refer to two different heights and their associated speeds. This works pretty well for areas with little terrain ups and downs and minimal cultural things around. You will see this equation, normally in the form of a graph, in numerous flight manuals, especially for larger aircraft.

For the question you have given, they are after (a), the wind speed decreases as you descend near the ground.

Thanks alot sir, your response is appreciated ????

Apologies, my emoji turned into the four question marks above

If that's the worst thing which happens today, I don't think I will worry too much. Main thing is that we answer questions so that your knowledge bank increases along the learning pathway.

J

I select B "Reverse to come from the left"

Quite so. However, might we enquire as to the reasoning behind your choice ?