The correct answer is C). Science is a collection of knowledge about the natural world, but it is also the process of discovering how the natural world works.
According to the definition of the word "Science", it is the study of the nature and behaviour of natural things and the knowledge that we obtain about them through observation and experiments. Therefore, it is not just a collection of knowledge (A), or only the process of discovering how the natural world works (B); but rather, the combination of both: The process of discovering is performed through observation and experiments, which brings us to the collection of knowledge, allowing us to know more about natural things.