Consider the following archaeological sites on the Indian subcontinent:
a. Bhimbetka
b. Kurnool caves
c. Mehrgarh
d. Burzahom
Arrange these sites in the order of the earliest evidence found, and match each site with its primary archaeological significance.
1
c, d, b, a
2
b, a, c, d
3
a, b, c, d
4
a, c, b, d