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Option 1 : A
The correct answer is option 1 i.e. A.
- The verbs in the sentence should be in the same tense to follow the rules of parallelism.
- The use of 'became' in part C indicates that the sentence is in the past tense.
- In part A, we will use the past tense form of the verb i.e. climbed.
Correct sentence- As they climbed higher, the air became cooler.
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