Select the most appropriate option that can substitute the highlighted segment in the given sentence.
Black carbon consists of tiny particles that can waft high over the atmosphere and be carried for thousands of kilometres.

Correct option is A

The correct substitution of the highlighted words is (a) high above the atmosphere.
Explanation: The phrase “above the atmosphere” accurately describes particles floating or wafting at a height exceeding the atmospheric layer. “High above” is a common collocation used to show elevation in relation to a spatial reference point.
Grammatical Rule Used:
✔ Prepositions of position like "above" are used to indicate a vertical relationship when there is no contact.
Example: The eagle flew high above the clouds.
�� Information Booster:
“Over” may imply covering or direction, while “above” is more appropriate for spatial elevation without contact.