The correct option is C On the basis of relevant facts confirmed both by observation and experiment
The passage states that the world we live in is full of things which excite us and incite our curiosity. In such atmosphere, the scientific worker tries to formulate and solve a variety of problems by the help of relevant facts collected through observation and experiment: "The scientific worker
attempts to formulate these problems in accurate terms and to solve them in the light of all the relevant facts that can be collected by observation and experiment." Thus, option C is the answer.