Short-run and long-run effects of a shift in demand

Suppose that the tuna industry is in long-run equilibrium at a price of $5 per can of tuna and a quantity of 400 million cans per year. Suppose the Surgeon General issues a report saying that eating tuna is bad for your health.

Part 1) The Surgeon General’s report will cause consumers to demand: a) more b) less tuna at every price.

Part 2) In the short run, firms will respond by: a) producing less tuna and running at a loss b) producing more tuna and earning positive profit c) entering the industry d) exiting the industry e) producing the same amount of tuna and earning positive profit f) producing the same amount of tuna and running at a loss

Shift the demand curve, the supply curve, or both on the following diagram to illustrate these short-run effects of the Surgeon General’s report.
Part 3) In the long run, some firms will respond by: a) producing less tuna and running at a loss b) producing more tuna and earning positive profit c) entering the industry d) exiting the industry e) producing the same amount of tuna and earning positive profit f) producing the same amount of tuna and running at a loss

until: a) new technologies are discovered that lower costs b) each firm in the industry is once again earning zero profit c) tuna populations grow large enough to support more firms d) consumer demand returns to its original level
Part 4) The new equilibrium price and quantity suggest that the shape of the long-run supply curve in this industry is: a) upward sloping b) horizontal c) downward sloping d) vertical in the long run