Consider the following statements:
Assertion: Iron ploughshares improved agricultural productivity.
Reason: Iron ploughshares could turn heavy, clayey soil more effectively than wooden ploughs.
1
Both A and R are true, and R is the correct explanation of A.
2
Both A and R are true, but R is not the correct explanation of A.
3
A is true, but R is false.
4
Both A and R are false.