The correct answer is: Only assumption II is implicit.
The statement “The present examination system needs overhauling thoroughly” does not necessarily mean that the present examination system is obsolete. It could be that the present examination system is working well, but that it could be improved by overhauling it. Therefore, assumption I is not implicit.
However, the statement does imply that overhauling the examination system would result in improvement. Therefore, assumption II is implicit.
Here is a more detailed explanation of each option:
- Option A: Only assumption I is implicit. This is the correct answer. Assumption I is not implicit, but assumption II is implicit.
- Option B: Only assumption II is implicit. This is not the correct answer. Assumption I is not implicit, but assumption II is implicit.
- Option C: Either I or II is implicit. This is not the correct answer. Assumption I is not implicit, but assumption II is implicit.
- Option D: Neither I nor II is implicit. This is not the correct answer. Assumption II is implicit.
- Option E: Both I and II are implicit. This is not the correct answer. Assumption I is not implicit, but assumption II is implicit.