Sir Karl Popper maintained that science develops by means of the process of...
...generalizing from observations and seeking confirming instances.
...formulating hypotheses based on reasonable guesses, deducing consequences from them and accepting the hypotheses that yielded correct predictions.
...developing hypotheses as conjectures and seeking to refute or falsify them
The best answer to this question is C. According to Popper, the way that science progresses is through falsification. Popper has been called the grandfather of falsification because of the emphasis that he places on the importance of falsification for the advance of science.
According to Popper, the only way that knowledge can truly progress is by us finding out what is not true. It is not possible, Popper says, to accurately use induction -- we cannot take a finite number of observations and conclude from those what is true. But it is possible to find out what is not true.
As the "falsification" link below says, Popper believes that:
Instead of seeing discovery of the truth as the aim of science, we should, rather, see scientific activity as a systematic attempt to ‘falsify’—or refute—bold and imaginative conjectures about the nature of the world.
This clearly shows that C is the best of these answers.