A gas has no mass. A gas has a large mass. A gas takes the shape of its container. A gas keeps its shape when placed in a container.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A teacher opens a can of food in the front of a classroom. Soon, all of the students in the classroom can smell the food. Which statement identifies a property of a gas that allows all of the students to smell the food?
Possibilities:
- A gas has no mass.
- A gas has a large mass.
- A gas takes the shape of its container.
- A gas keeps its shape when placed in a container.

A gas takes the shape of its container.