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

☀ The fruit have to be picked very early in the morning.

Explanation for other options:

☀ The fruit had been picked very early in the morning. This option uses the past perfect tense ("had been picked"), which suggests an action completed before a certain point in the past. The original sentence uses "have to pick," indicating a present or future action, not a completed action in the past.

☀ The fruit were to be picking very early in the morning. This option has incorrect verb forms "were to be picking." The correct form should be "were to be picked."

☀ The fruit were to be picked very early in the morning. This option has the correct passive form, using "were to be picked" to indicate the obligation to pick the fruit in the passive voice. This option is grammatically correct and maintains the original meaning of the sentence.