Topic: Pronoun (সর্বনাম),

Best Answer Explained in Below-:

The correct sentence is D) "He availed himself of the opportunity." This choice appropriately uses the verb "avail" in its correct form and context. The phrase “to avail oneself of something” means to take advantage of or utilize an opportunity.

Option A, “He availed with the opportunity,” is incorrect because "avail" should be used with "of," not "with."

Option B, “He was availed with the opportunity,” is also incorrect. The passive construction is awkward and does not convey the intended meaning. The verb “avail” typically does not appear in the passive voice in English.

Option C, “He was availed of the opportunity,” while it uses "of" correctly, ineffectively employs passive voice, making it sound unnatural in context.

In contrast, option D employs an active voice that clearly communicates the subject's proactive engagement with the opportunity. Thus, "He availed himself of the opportunity" emphasizes that he actively seized the chance presented to him, making it the most suitable choice.