Solution:
If the said assumption A is true, suppose the literacy rate in a state is 78% and the net attendance ratio in the second stage is 47%. It is not necessary, nor does it imply that the given reason R should be true too.Because R states that the reason for the 78% literacy rate in a place would indicate that for primary or elementary education, more than half the students must be going out to other states. This, first of all, is not probable. And besides, the assumption does not say anything about elementary education. So, it is irresponsible to draw such conclusions for any reason.