The study of sciences is based on
A. Experimentation
B. Observation
C. Evidences
D. All of the above

Hint: Science is derived from the Latin word “Scientia”, which means “knowledge”. Studying science refers to building and collecting knowledge in the form of testable explanations and predictions about the universe. Scientific research can be as classified as basic or applied research. Basic research is done for the search of knowledge and applied research is the search for solutions to practical problems using the basic knowledge.

Complete explanation:
Option A Experimentation: Experimentation is a scientific research method where conscious manipulation of certain aspects of a real system are made and the effects of that manipulation are observed. Experimentation is done to determine the quality, performance, or reliability of something. It is only a part of the study so this option cannot be chosen.
Option A is incorrect.
Option B Observation: Observation is the acquisition of information from a primary source. The data and results collected through experimentation is analysed. Through observation, a particular characteristic of the scientific study is examined. It is a part of scientific study.
Option B is incorrect.
Option C Evidences: Evidence is the information obtained through observation and documentation of an experiment. It is an important part of the scientific study that is applicable in many disciplines. The pieces of evidence are useful to validate or disprove a stated hypothesis or statement. Since evidence comes from experimentation and observation, this option cannot be chosen.
Option C is incorrect.
Option D All of the above: Scientific study or the study of sciences involve all the three options including experimentation, observation and evidence.
Option D is correct.

Hence, Option D all of the above is the correct answer.

Note:
The study of science plays a greater role in knowledge creation. Modern science is majorly divided into three namely the natural sciences, social sciences and formal sciences. Natural sciences study nature in the broadest sense (for example biology, physics and chemistry). Social sciences is the study of individuals and societies (economics, psychology, and sociology). Formal sciences deal with symbols and rules (logic, mathematics, and theoretical computer science).