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

☀ They have left and the drinks haven't been paid for.

Explanation for other options:

☀ They had leave and the drinks haven't been paid for. This option uses the wrong verb form. The correct form should be "They have left," not "had leave."

☀ They have left and the drinks were not been paid for. This option has a grammatical error with the use of "were not been paid for." The correct form should be "the drinks haven't been paid for."

☀ They were left and the drinks won't been paid for. This option is not grammatically correct. The correct form should be "the drinks haven't been paid for." Additionally, "They were left" changes the meaning of the sentence. The original sentence talks about the fact that "They" left, not that they were left by someone else.