The correct answer is (a). Kerala, Tamil Nadu, Punjab, and Delhi are the four top most states in India as per the ‘Educational Development Index’ (February 2011).
Kerala has the highest literacy rate in India, at 94.00%. It also has the highest gross enrollment ratio (GER) in elementary education (100%), secondary education (93%), and higher education (26%).
Tamil Nadu has a literacy rate of 80.09%. It has a GER of 100% in elementary education, 82% in secondary education, and 23% in higher education.
Punjab has a literacy rate of 75.84%. It has a GER of 100% in elementary education, 80% in secondary education, and 22% in higher education.
Delhi has a literacy rate of 86.21%. It has a GER of 100% in elementary education, 87% in secondary education, and 25% in higher education.
The other options are incorrect because they do not include Kerala.