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

☀ Are books purchased by him from the Book store?

 Explanation for other options:

☀ Had books purchased by him from the Book store? This option uses "had books purchased," which is not the correct verb form for the passive construction. The correct form should be "are books purchased" to form the passive voice.

☀ Were the books purchase by him from the Book store? This option uses "were the books purchase," which is not the correct verb form for the passive construction. The correct form should be "are books purchased" to form the passive voice.

☀ Had been the books purchased by him from the Book store? This option uses "had been the books purchased," which is not the correct verb form for the passive construction. The correct form should be "are books purchased" to form the passive voice.