Items that have a ph level of 1 would be considered a

strong base
strong base
strong acid
weak base

Items that have a "pH level of 1" would be considered a "strong acid".

Option: C

Explanation:

pH scale is useful for accounting acidic or basic behavior of liquid solutions. pH scale starts from 1 to 14 and each number represents the "concentration of hydrogen ions" in the solution like lower pH showcase "higher concentration of hydrogen ions" but higher pH is indication of "lower concentration of hydrogen ions" and measured logarithmically. Scale represents 0 to 6 as Acidic, 7 as neutral and 8 to 14 as basic pH . For example "battery acid" is most acidic, blood is neutral and liquid drain cleaner is most basic.

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.