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what is the definition of a pandemic?
a. when a disease does not have a known cause
b. when a disease quickly spreads around the world
c. when a harmless disease has no cure or vaccine
d. when a disease infects a very small group with no cure or vaccine
clear my choice

Explanation:

A pandemic is defined as a disease that spreads rapidly across a large region, often globally. Option a is about an idiopathic disease, c is incorrect (harmless + no cure/vaccine doesn't define pandemic), d is about a small - group disease (not pandemic). Option b matches the definition.

Answer:

b. When a disease quickly spreads around the world