If a scientist needs to use a large dataset to explore how corn grows in different soils, how would this data be classified?

a. descriptive b. quantitative c. qualitative d. mixed methods

Option C, Qualitative

Explanation:

A qualitative data set consists of description of processes. These process may include measures to do something, ways to conduct some task or even impact of several factors on something.  

Here, in this case scientist is dealing with a data set that talks about methods/ways/techniques to grow corns in different soil which is purely a subjective  data base consisting of procedures defining the cultivation of corn in different soil types. Hence option C is the correct answer.  

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

i believe the answer is c