The essential qualities of a researcher are

Spirit of free enquiry
Reliance on observation and evidence
Systematization or theorizing of knowledge
All of the above

The correct answer is D. All of the above.

A researcher is someone who conducts research. Research is a systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.

The essential qualities of a researcher are:

  • Spirit of free enquiry: A researcher must be able to think critically and independently. They must be able to question the status quo and come up with new ideas.
  • Reliance on observation and evidence: A researcher must be able to collect and analyze data in a systematic way. They must be able to draw conclusions based on the evidence they find.
  • Systematization or theorizing of knowledge: A researcher must be able to organize and present their findings in a clear and concise way. They must be able to communicate their findings to others in a way that is easy to understand.

These qualities are essential for a researcher to be able to conduct high-quality research.