Physics is a real science among the options. So the correct option is A.
What is physics?
The study of matter, constituents of matter, its motion and behaviour and all the other entities of the matter is called physics. The main goal of physics is the understanding of the Universe.
It is a fundamental disciple of science as all other branches of science are directly or indirectly dependent on it.
The scientist specialising in the field of physics is called a physicist. Physics is one of the oldest scientific disciples to be studied.
Physics, along with chemistry and are the three main scientific branches which have been further divided into various types but a basic knowledge of physics is required for understanding almost all branches of science.
This is because there is no rigid definition of the boundaries of physics. Physics enters other areas of study to form different subjects like quantum chemistry.
Therefore the correct option is A.
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