____ by a talented composer, the song was a masterpiece.a) Writingb) Writtenc) Having writtend) Wrote

To solve the question, we need to determine the correct word form that fits the sentence contextually and grammatically.

Analysis of Options

1. a) Writing - This is a gerund and can imply an ongoing action, but it doesn't fit the structure of the sentence since we need something that shows completion in relation to the song.

2. b) Written - This is a past participle and fits well since it indicates that the song was completed by the composer, but it lacks the necessary structure to connect with "by a talented composer."

3. c) Having written - This is a perfect participle phrase indicating that the action of writing was completed before the song was referenced. It fits well within the context of the sentence.

4. d) Wrote - This is the simple past form, which doesn't convey the order of actions as clearly as "having written" does.

Conclusion

The most appropriate choice to complete the phrase is:

Final Answer

c) Having written

So the complete sentence reads: "Having written by a talented composer, the song was a masterpiece."