The correct passive form of the given sentence is:

☀ Why were you deprived of the membership by him?

Let's break down the options:

1. Why you were deprived of the membership? (Incorrect) This option correctly uses the passive voice, but it does not include the agent "by him," which is essential to maintain the meaning of the original sentence.

2. Why were you deprived of his membership by him? (Incorrect) This option changes the meaning of the original sentence by introducing "his membership" instead of "the membership." The original sentence does not specify whose membership it is.

3. Why was he deprived of his membership? (Incorrect) This option changes the subject from "you" to "he," and it also does not include the agent "by him," which is necessary to maintain the meaning of the original sentence.

4. Why were you deprived of your membership by him? (Correct) This option correctly uses the passive voice, maintains the original meaning, and includes the agent "by him." It is the correct passive form of the given sentence.