The meaning of "spread like a cloud" indicates that is turned white. So, the correct option is A.
Cloud may be defined as an observable abundance of crystallized watery vapor sailing in the atmosphere, typically high above the general deck of the ground.
The spread of the cloud makes the atmosphere white. This is because it consists of crystallized water vapor above the ground. Apart from this, the most appropriate use of the given sentence matches the first option.
Therefore, the correct option for this question is A.
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