The correct answer is: C. Either I or II is implicit.
The statement does not say anything about whether the candidate reads newspapers or not. It only says that the candidate listens to the 9.00 p.m. news on radio. Therefore, assumption I is not necessarily true.
The statement also does not say anything about whether recent news is broadcast only on radio. It only says that the candidate listens to the 9.00 p.m. news on radio. Therefore, assumption II is not necessarily true.
However, the statement does suggest that the candidate believes that listening to the 9.00 p.m. news on radio is a good way to keep up-to-date with recent news. This suggests that the candidate may not read newspapers, or may not believe that reading newspapers is a good way to keep up-to-date with recent news. Therefore, either assumption I or assumption II could be true.