Correct option is B
Statement:
Reclaimed land should be avoided as it only has disadvantages.
Arguments:
I. Many countries have no option but to reclaim land to provide for fire increasing population.
Argument I is weak and contradicts the statement. It provides a valid reason for reclaiming land, despite potential disadvantages.
II. Land that is reclaimed has long lasting effect on nature as it deteriorates ecosystem and biodiversity.
Argument II is strong and supports the statement. Reclaimed land can indeed harm the ecosystem and biodiversity.
So, I weaken, while II strengthens the statement
Thus, Option B is the correct answer.