Answer:
A paragraph discussing how hard it is to get students to do their homework
Explanation:
Piniforms or uniforms do affect (either positively or negatively) students' behavior and academic performance at school. But they have nothing to do with the difficulties in getting students do their homework. So this paragraph is irrelevant; and hence does not merit inclusion in the final draft of the paper.
All other options (paragraphs) are relevant to the school paper in one way or the other.
Through water sources like rivers or oceans
A sentence fragment...
It does not sound right, therefore it is not complete (fragment). Run-on sentences are complete, yet they are extended to much.
The right answer would be B