Choice (a) states that the new KJB is on similar lines as NDF. But it is not said that KJB is the sane as NDF. Moreover it is not said that NDF will not be conducted.
There is no information regarding how the private colleges are going to admit the candidates. Hence, neither (a) nor (b) strengthens the case for continuing with NDF.It is said in choice (c) that there are preferred private colleges which want to admit candidates based on NDF score. If NDF is discontinued the students who wish to undergo NDf course will not join the institute. Hence (c) supports the case for continuing with NDF.Choice (s) has no relevance to the context.Hence (c) supports the case for continuing with NDF.