Answer:
Option (b) is correct.
Step-by-step explanation:
Before 1966, Catholics were restricted from consuming meat on Fridays and they ate fish on Fridays. But after 1966, there were no such restrictions are there and they are free to eat meat on Fridays, now Catholics also consume meat on Fridays.
This will result in an increase in the demand for meat and demand for fish decreases. So, this will shift the demand curve of fish leftwards and demand curve of meat rightwards.