The source of evidence refers to a. how reliable the information is b. the type of information collected c. where the information came from d. the experimental groups being studied

The source of evidence refers to C. where the information came from.

There are two sources of evidence the primary or original source or evidence and secondary source. The primary source, in history, is anything that serves as an original source of information about the topic. It could be an artifact, document, manuscript, diary, autobiography and the like. Moreover, in the field of journalism, a primary source can be a person that has a personal or direct knowledge of a subject or situation or a written document by such a person. Meanwhile, secondary sources are evidences or sources that are extracted or build upon primary sources.

the most logical answer would be a

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.