The correct answer is: Both I and II are implicit.
The statement “A visit of school children to forest to widen their knowledge of natural resources has been arranged.” implies that forests are full of natural resources and that children are likely to learn from their interaction with the new environment.
Assumption I is implicit because the statement says that the children are going to the forest to learn about natural resources. This implies that the forest is a place where natural resources can be found.
Assumption II is implicit because the statement says that the visit is to “widen their knowledge of natural resources.” This implies that the children are likely to learn something new from their visit to the forest.
Therefore, both assumptions I and II are implicit in the statement.