Jean$-$Marie Bourjolly's restaurant has the following inventory items that it orders on a weekly basis:

$\backslash$table$[[$Inventory Item,$ Value$/$Case # Ordered$/$Week$,],[$Rib eye steak,$157,5],[$Lobster tail,$267,8],[$Pasta$,45,10],[$Salt$,25,5],[$Napkins$,34,17],[$Tomato sauce,$45,27],[$French fries,$65,5],[$Pepper$,25,9],[$Garlic powder,$33,13],[$Trash can liners,$34,8],[$Tablecloths$,54,6],[$Fish fillets,$165,6],[$Prime rib roasts,$188,6],[$Oil$,50,35],[$Lettuce $($case$),57,14],[$Chickens$,97,5],[$Order pads,$34,5],[$Eggs $($case$),44,15],[$Bacon$,78,6],[$Sugar$,26,6]]$

a$)$ Which is the most expensive item, using annual dollar volume?

b$)$ Which are C items?

c$)$ What is the annual dollar volume for all $20$ items?