I'll give someone else a chance to answer this one first. Thank you though for this one!
Left work a few hrs early today to get some last minute reviewing of notes in. Half day tomorrow to go through all of my tabs and just relax. C'mon Friday!
Volume during the highest rated hour: V= 700+775+880+720 = 3075. Highest 15 minute volume within the same hour. v= 880. PHF= V/4v= 0.874. Most nearly C.