While walking on a public sidewalk, Anson was struck by a piece of lumber that fell from the roof of Bruce's house. Bruce had hired Chase to make repairs to his roof, and the lumber fell through negligence on Chase's part. If Anson brings an action against Bruce to recover damages for the injury caused to him by Chase's negligence, will Anson prevail? 
Yes, under the res ipsa loquitur doctrine.  Yes, if Chase's act was a breach of a nondelegable duty owed by Bruce to Anson.  No, if Chase was an independent contractor rather than Bruce's servant.  No, if Bruce exercised reasonable care in hiring Chase to do the repair work. 