What Is Difference Between an Epidemic and a Pandemic

What is difference between an epidemic and a pandemic?

A) An epidemic is a disease that spreads or becomes more common;a pandemic is a disease that remains stable in terms of numbers affected.
B) An epidemic is a disease;a pandemic is a treatment.
C) An epidemic is restricted to a local region;a pandemic is more global.
D) An epidemic is a disease with fairly low mortality;a pandemic has a much higher mortality rate.
E) An epidemic is caused by a bacterial infection;a pandemic is caused by a viral infection.