Which of the following statements is true? the boiling point of a substance is dependent of volume. during sublimation, a plasma changes directly into a solid. the nucleus of an atom is made of protons and neutrons. electrons orbit the nucleus of an atom in straight line

The nucleus of an atom is made of protons and neutrons.

Explanation:

Boiling point is the temperature at which vapor pressure of the liquid becomes equal to the atmospheric pressure. Boiling point of a liquid is not dependent on the amount of liquid and is not dependent on volume.

Sublimation is the process where solid state changes to gaseous state by escaping liquid state.

An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.  Protons and neutrons are located in the center of an atom called as nucleus where the mass of an atom is concentrated.  

Electrons are located outside the nucleus where they orbit in different energy levels around the nucleus in circular paths.

the answer is option a.