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

☀ His symphony was performed for the first time last week.

Explanation for other options:

☀ His symphony were performing for the first-time last week. This option is not in the correct passive voice. It uses "were performing," which is in the active voice, and it does not represent the correct passive form. The correct form should use the passive construction "was performed."

☀ His symphony is performing for the first-time last week. This option uses "is performing," which is in the present tense and does not represent the correct passive form. The original sentence is in the past tense, so the correct form should use "was performed."

☀ His symphony was performed for the first-time in previous week. This option changes "last week" to "previous week," which alters the meaning of the sentence. The original sentence refers to a specific week (last week), not a general previous week. The correct form should use "last week" as in the original sentence.