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

☀ Hina was allowed to go, but Monty was not allowed to go.

 Explanation for other options:

☀ Hina was allowed to go, but Monty was not allowing to go. This option has an incorrect form "was not allowing" for Monty. The correct passive form should be "was not allowed."

☀ Hina was allowed to go, but Monty were not allowed to went. This option has incorrect verb forms "were not allowed to went." The correct form should be "was not allowed to go."

☀ Hina was allowed to goes but Monty was not allowed to go. This option has incorrect verb forms "was allowed to goes." The correct form should be "was allowed to go."