The correct option is D Diamond
Andhra Pradesh is very rich in mineral
resources. It is a large producer of granites
of various colours, Kadapa stones, etc used
in buildings. It also produces limestone and
dolomite used in cement industry. Northern
districts have large coal deposits
(Kothagudem in Godavari valley) while the
Krishna Godavari basin has great potential
for mineral oil and gas. AP is historically
known for its famous diamond mines too
and some of the largest diamonds in the
world were found here.