The correct answer is: C. Either I or II follows.
The statement “Vegetable prices are soaring in the market” does not necessarily mean that vegetables are becoming a rare commodity. It could mean that the demand for vegetables is high, or that the supply of vegetables is low. It could also mean both.
The statement also does not necessarily mean that people cannot eat vegetables. It could mean that people are choosing to eat less vegetables, or that they are finding it more difficult to afford vegetables. It could also mean both.
Therefore, either conclusion I or conclusion II could follow from the statement.