Assertion (A): Europe emerged as the centre of world trade in the 19th century.
Reason (R): Till the eighteenth century, China and India were among the world's richest countries.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is NOT the correct explanation of A.
C. A is true but R is false
D. A is false and R is 'True