Correct option is A
Information Booster:
Megasthenes was a Greek ambassador in the court of Chandragupta Maurya, and he wrote a book titled "Indica". Unfortunately, the original text of Indica is lost. However, fragments of it survive in the works of several later classical writers:
Arrian – Quotes extensively from Indica in his work "Indika".
Strabo – Refers to Indica in his Geography.
Pliny the Elder – Mentions India and Megasthenes in his Natural History.
These three used Indica as a source of information on India.Livy, however, does not mention Megasthenes or Indica.