GIVEN BRAINLIEST

The main reason that scientists would do a descriptive investigation is that .
A. they don't like doing normal experiments
B. they can't make observations about their topic
C. they're trying to make a significant new scientific discovery
D. they're studying something for which they can't do an experiment

The main reason that scientists would do a descriptive investigation is that They're trying to make a significant new scientific discovery (Option C)

Explanation:  

Mostly all the investigation of a Scientist begins with an observation, then they make a hypothesis by means of this observation.Then the Scientist would try to make the hypothesis either true or false by doing so many researches, experiments and so on. If they found something correct or wrong regarding their hypothesis which gives us a new discovery or any corrections to be done in their new discovery by repeating or modifying their experiments.

Yes i think so not 100 percent sure though