Respuesta :
"The amount of matter in a substance" is the one among the following choices given in the question that best defines mass. The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has actually come to your desired help.
Answer:
option (A)
Explanation:
The amount of matter contained in the matter is called its mass.
Mass is a scalar quantity and it always remains constant.
The SI unit of mass is kg.