Detailed Solution:
The correct answer is “Both A and R are true but R is not the correct explanation of A”.
Kerala's density of population as per 2011 census is 860 persons per sq. km. Kerala has the highest effective literacy rate of 94 per cent among Indian states as per 2011 census.
While high literacy rate can contribute to factors such as better healthcare, awareness of family planning, and socio-economic development which could indirectly influence population density, it's not a direct and straightforward explanation for high population density alone.