Which sentence is punctuated incorrectly?
the famous fifth symphony was composed after beethoven went deaf.
beethoven composed his famous fifth symphony after he had gone deaf.
after he had gone deaf, beethoven composed his famous, fifth symphony.
beethoven's famous fifth symphony was composed after he had gone deaf.
a?

After he had gone deaf, Beethoven composed his famous, Fifth Symphony.

Explanation:

The chosen sentence contains a comma which wrongly separates the adjective famous from the noun phrase it modifies, which is Fifth Symphony. Therefore, the correct version of the sentence is:

After he had gone deaf, Beethoven composed his famous Fifth Symphony.

The rest of the alternatives are accurately punctuated.