What is the complete subject ?

Which of the following sentences most clearly uses topical organization? a. do you have problems with mosquitoes and gnats? fabulous exterminators can ! b. we've gathered at this conference to discuss three things: poverty, war, and disease. c. killer bees have spread up from south america into mexico and the united states. d. first, gather all the painting supplies you need. next, lay them out on a work bench.

According to auden’s “musée des beaux arts”, who understands human suffering

What started the riot in ephesus that nearly killed paul’s traveling companions?