The correct passive form of the given sentence is:

☀ I am guided by Siva.

Let's break down the options:

1. I am guided by Siva. (Correct) This sentence correctly uses the passive voice and conveys the same meaning as the original sentence.

2. I have been guided by Siva. (Incorrect) This sentence uses the present perfect tense ("have been guided"), which suggests a completed action with present relevance. The original sentence doesn't imply a past action with present relevance but rather a general statement about the present situation, which is better represented by option 1.

3. I am being guided by Siva. (Incorrect) This sentence uses the present continuous tense ("am being guided"), which implies an ongoing action at the present moment. The original sentence doesn't indicate an ongoing action but a general statement about the present situation, as shown in option 1.

4. I was guided by Siva. (Incorrect) This sentence uses the past tense ("was guided"), which indicates a completed action in the past. The original sentence is in the present tense, so option 1 better reflects the intended meaning.