The correct Active/Passive form of the given sentence is:

☀ Nothing like this has been seen by me.

Explanation for other options:

☀ Anything like this had not been seen by me. This option is in the passive voice, but the word order is not correct. The correct form should be "Anything like this had not been seen by me."

☀ Anything has not been seen like this by me. This option is in the passive voice, but the word order is not correct. The correct form should be "Anything like this has not been seen by me."

☀ Nothing had been seen by me like this. This option is in the passive voice, but the tense is incorrect. The original sentence is in the present perfect tense, so the correct form should be "Nothing like this has been seen by me."