Answer :
I think the last revision is the answer, as both are independent of each other and tell us two separate clauses in the same sentence
Answer:
While Padmi looks frantically for her pen, her sister calmly writes with it.
Explanation:
This is the revision that is able to maintain clause 1 and clause 2 as independent clauses. In this sentence, both clause 1 and clause 2 express complete ideas. The first section of the sentence explains Padmi's situation, while the second section expresses her sister's situation. By combining the two, the reader gets a more complete and well-structured sentence.