A large magnet. A magnet, regardless of type, is quite heavy. Especially if it's a rather dense one because it'll weight more because of more mass occupying a small space. It's a magnet because of the box's attraction to the steel table rather than concrete. Magnets attract metals instead of concrete.
Answer:
D
Explanation:
This option certainly supports nature itself as an intelligent force by attributing knowledge of how to function to the life inside the body described in the passage. The life force is said to exert an influence on the body with certain skill that the excerpt describes as cunning.
Use of words with such a purpose usually refer to motivation and in the context of this passage gives an essential vitality to nature (life) keen enough to make decisiones and influence bodies.
The b best answer that I could see is D because it correlates to the actual question. But c also looks good because it gives a reason as why not to buy them from a shop/private owner.
Best of Luck...Nathan...L.