Select the correct Passive form of the given sentence.

He completed the story on time.

The story was completed by him on time.

Let's analyze each option:

☀ The story was being completed by him on time. Explanation: This option is in the passive voice, but it uses the present continuous tense ("was being completed") which suggests an ongoing action in the past. However, the original sentence doesn't imply ongoing action, so this option is not the correct passive form.

☀ The story completed by him on time. Explanation: This option is not in the passive voice. It uses the active voice, and the sentence is grammatically incorrect. The correct passive form should include a form of "to be" followed by the past participle of the verb "complete."

☀ The story had completed by him on time. Explanation: This option is not in the passive voice. It uses the active voice and has incorrect grammar. The correct passive form should include a form of "to be" followed by the past participle of the verb "complete."

☀ The story was completed by him on time. Explanation: This option is the correct passive form of the given sentence. It uses the past tense of "to be" ("was") followed by the past participle of the verb "complete" ("completed"). The sentence is in the passive voice, indicating that the story was completed by him without mentioning him as the subject explicitly.