Select the correct passive form of the given sentence.

My friend narrated a very interesting story at the International Storytelling Festival.

A very interesting story was narrated by my friend at the International Storytelling Festival.

The correct passive form of the sentence "My friend narrated a very interesting story at the International Storytelling Festival" is A very interesting story was narrated by my friend at the International Storytelling Festival.

The other options are incorrect because:

• A very interesting story is being narrated by my friend at the International Storytelling Festival uses the present continuous tense, while the original sentence is in the past tense.
• A very interesting story has been narrated by my friend at the International Storytelling Festival uses the past perfect tense, while the original sentence is in the simple past tense.
• A very interesting story is narrated by my friend at the International Storytelling Festival does not use the verb "to be" in the passive voice.