Wind transports sand grains mostly as a part of the suspended load with equal amounts in the air as in the bed load by siltation, as part of the bed load only during the most severe dust storms

as in the bed load by siltation

Explanation:

Wind usually carry all heavy particles through Siltation. In this process, the sand is carried as a heap of sand for a small distance and mostly it stays close to the ground surface due to its weight.

However lighter particles like clay and silt are carried as suspension in air as they are light weighted and can remain suspended at greater heights for a long time.

Hence, the correct answer is "as in the bed load by siltation"

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