I think you mean "epidemic", since that other word does not exist.
<span>A widespread occurrence of an infectious disease in a community at a particular time.</span>
Modern medicine works. Prehistoric medicine is unknown because it is before history has recorded it. But let’s say that caveman found that they ate the leaves from the willow tree their headache went away. Aspirin is made from willow leaves.
The drug itself is the same. How medicine is practiced is totally different.
It could be "B" because indian belief is hinduism & arab don't see that "normal".
Indian Ocean/Indian Ocean trade routes