Solution:(d) The exhibition was inaugurated by the Governor of the state in a grand way. (Correct)(a) The exhibition had been inaugurated by the Governor of the state in a grand way. (Incorrect Tense)
(b) The exhibition inaugurated by the Governor of the state in a grand way. (Helping Verb is missing)
(c) The exhibition has been inaugurated by the Governor of the state in a grand way. (Incorrect Tense)