Answer:
The answer is: letter d, Isobars that are closely spaced indicate a large pressure difference over a small area and strong winds. Isobars that are far apart indicate a small pressure difference over an area and light winds.
Explanation:
An "isobar" is a line that is being drawn on a weather map. The areas with same pressures are being connected by the isobar. The value of the pressure is indicated by "millibars." This is vital when it comes to locating areas on the weather map that have high pressure and low pressure.
Once the isobars are closely spaced, it indicates that there is a large pressure difference over a small area. There is a strong pressure gradient because the speed of the wind is high. This is, thus, associated with stronger winds.
On the contrary, isobars that are far apart have weak pressure gradients. This means that the wind speed is light thus resulting to lighter winds.
Thus, this explains the answer.