A few clips made of magnetic material are placed in a container and a magnet attracts the clips from outside the container. Which of these must be true about the material of which the Container is made :

a. It should be a metal
b. It should be a non-metal
c. It should be non-magnetic in nature
d. It should be transparent

To determine the material of which the container is made, we can infer some properties based on the given situation.

In this case, the container is attracting the magnetic clips from outside using a magnet. From this information, we can deduce that the material of the container must be magnetic because magnets attract magnetic materials. Therefore, the correct answer is:

c. It should be non-magnetic in nature