The correct answer is: Only conclusion II follows.
The statement is: Jade plant has thick leaves and it requires little water.
Conclusion I: All plants with thick leaves require little water.
This conclusion does not follow from the statement. Just because one plant with thick leaves requires little water does not mean that all plants with thick leaves require little water. For example, cacti also have thick leaves, but they require a lot of water.
Conclusion II: Jade plants may be grown in places where water is not in abundance.
This conclusion does follow from the statement. If a plant requires little water, then it can be grown in places where water is not in abundance.
Therefore, the correct answer is: Only conclusion II follows.