Scientists best apply critical thinking in their work through
a. the scientific method
b. observation
c. hypotheses
d. experimentation

a. the scientific method

Explanation:

The scientific method can be define as the detail and serial procedure used by the scientists to conduct a particular experiment or research. The scientific method can be designed, manipulated and altered depending upon the desire of the scientist. These features emphasizes over the critical thinking of the scientists. In scientific method an observation is made over the natural process, then a hypothesis is framed, the hypothesis is tested on the basis of experimentation and conclusion is made.

i think that the best answer would be c.

tell me if im wrong : )