The wrong statement in Viktor's summary is When a round solid ball is placed in a box, the ball takes the shape of the box
The matter has three main states which are
Solid
Liquid
Gas
These states define the way we interact and manipulate materials. For instance:
Liquids take the shape of the container that contains them. For example water, milk, soda, among others.
Solids have a defined shape and do not deform when manipulated or placed inside another container. For example, a round solid ball.
Gases generally do not have colors and their atoms are not organized so they do not have a definite shape and take the shape of their container. For example, the air in a balloon.
According to the above, the error in Viktor's summary is in the first phase, and the correct statement is A. because solids does not take the shape of its container.
