Correct option is C
The correct sequence is
ABDC.
Explanation of the correct sequence:
·
A introduces “Rayalaseema” as one of the backward regions.
·
B follows logically by stating the problems faced—degradation and poor crop productivity.
·
D adds further depth by mentioning data and explaining
why fertility is low—SOC depletion and food shortage.
·
C shows
what is being done in response by the National Soil Survey organisation.
· Sentence 6 wraps up by specifying the nature of the advice.