Which sentence has correct punctuation?

Question

A: My chances of becoming a vet therefore, have greatly improved.

B: My chances of becoming a vet, therefore, have greatly improved.

C: My chances of becoming a vet therefore have greatly improved.

D: My chances of becoming a vet, therefore have greatly improved.

Answer 1

B: My chances of becoming a vet, therefore, have greatly improved.

Answer 2

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