The answer is: [A]: fragment . _________________________________________________________ The phrase: "Since each group depends upon the other groups." _________________________________________________________ is NOT correct as it is — thus eliminating "Answer choice: [C]: correct" ; __________________________________________________ and is NOT a 'run-on sentence' — thus eliminating "Answer choice: [B]: run-on" . ____________________________________________________ Rather, the phrase: _____________________________________________________ "Since each group depends upon the other groups." ; _____________________________________________________ is a sentence FRAGMENT; which is the remaining answer choice given— "Answer choice: [A]: fragment" . ________________________________________________________