Step 1: Recall the standard definition used in the Economic Survey and in the NCERT textbook. Step 2: Literacy Rate measures the proportion of the literate population in the age group of 7 years and above. Step 3: The Net Attendance Ratio, in contrast, is the total number of children of the age group 14 and 15 years attending school as a percentage of the total number of children in the same age group. Step 4: Hence the blank is filled by '7 years' - Option (A).