Only option A is grammatically correct. Remaining options do not follow the parallelism.
Option B: "Not only" is followed by an independent clause("I can get a good job"). So, this is incorrect.
Option C: "best in job" is incorrect.
Option D: "not only" is followed by an independent clause.
Option E: "I found not only best in the country" is incorrect.
Hence, answer is option A.
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