The correct answer is A. 108%.
Crop density is the ratio of the area under cultivation to the total geographical area of a country or region. It is a measure of the intensity of agricultural land use. A high crop density indicates that a country or region is using its agricultural land very efficiently.
Bihar has a crop density of 108%, which means that 108% of its geographical area is under cultivation. This is higher than the national average of 104%. This indicates that Bihar is using its agricultural land more efficiently than the national average.
C. 118% and D. 128% are incorrect because they are not the actual crop density of Bihar.
E. None of the above is also incorrect because it is not a possible answer.