The correct answer is: Only assumption I is implicit.
The statement only tells us that the prices of personal computers showed the highest decline from June 2005 to December 2005. It does not tell us anything about the prices of other articles. Therefore, assumption I is implicit. Assumption II is not implicit, because the statement does not tell us anything about the prices of personal computers in the first six months of 2005.
Here is a more detailed explanation of each option:
- Option A: Only assumption I is implicit. This is the correct answer, as explained above.
- Option B: Only assumption II is implicit. This is not the correct answer, because assumption II is not implicit.
- Option C: Either I or II is implicit. This is not the correct answer, because assumption II is not implicit.
- Option D: Neither I nor II is implicit. This is not the correct answer, because assumption I is implicit.
- Option E: Both I and II are implicit. This is not the correct answer, because assumption II is not implicit.