Answer: b
Explanation: the coil cant be too short or too long
The sand particles are transported by the wind according to the direction of it
<h3><u>
Definition:</u> </h3>
A natural monopoly is created when a player in the market grows capable of offering the best service at a price its other competitors cannot.
<h3><u>
Examples:</u> </h3>
The electricity supply boards and the railway boards run by the government.
<u>Following are the reasons why such natural monopolies are allowed to exist in the free market system:
</u>
- They offer affordability to the general public.
- They function according to the convenience of the public.
- They dispense facilities that are not offered by anyone else at the same price.
d. continuous urban development connected by transportation routes.