I have e_______ the problem, and here are some solutions that I've found.

• A. Examine
• B. Examinable
• C. Examined
• D. Examining

Answer: (C)

The sentence uses the present perfect tense to show a completed action with relevance to the present. After "have," the verb should be in the past participle form to indicate what you did up to now. Examined is the correct past participle of examine, so “I have examined the problem” means you looked at the problem at some point in the past and that experience informs what you’re presenting now.

Examine doesn’t fit because it’s the base form, not the past participle needed after “have.” Examinable is an adjective meaning capable of being examined, not a verb form. Examining is the present participle; with “have,” you’d need a form like “have been examining” to show ongoing action, not a completed one.