The expert provided his own personal opinion on the subject.
- NO CHANGE
- his personal opinion
- his own opinion
- his opinion (correct answer)
Explanation: This question identifies redundancy in possessive expressions related to personal views. 'His own personal opinion' contains redundancy because 'his' already establishes ownership, making both 'own' and 'personal' unnecessary - opinions are inherently personal to the holder. Choice D 'his opinion' expresses the complete meaning concisely. Choices B and C maintain partial redundancy. When pronouns establish ownership, additional possessive words like 'own' or 'personal' typically become redundant.