What happened immediately following the Battle of Marathon? The Persians went on to burn the city of Athens.
The Greeks trapped and destroyed the Persian navy.
The Greeks won a victory, and the Persians retreated.
The Persians began the golden age of the Persian Empire.

C

Explanation:

I got it correct on edgecourseware dashboard.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.