Which sentence correctly uses a comma to separate the introductory phrase?

commerce is represented by, the female statue crowned with a wreath of olive leaves.
the female statue, crowned with a wreath of olive leaves, represents commerce.
crowned with a wreath of olive leaves, this female statue represents commerce.
the wreath of olive leaves crowning the female statue, represents commerce.

Punctuation is used to organize a sentence additionally to create more clear sense and stress in a sentence.

Commas are frequently used punctuation in a sentence. They are used to create a short pause in a sentence.

Therefore, the sentence which correctly uses a comma to separate the introductory phrase is,

The female statue, crowned with a wreath of olive leaves, represents commerce.

This sentence is correct because it uses the punctuation mark comma appropriately to make logical groupings. Also, it helps in segregating one list from another. Hence, the above sentence comma is used to separate a series of phrases and separate the introductory phrase appropriately.