Writing a thesis that hedges instead of argues
Sentences like 'Social media can be both beneficial and harmful depending on the situation' do not earn Row A because they take no position. A grader cannot disagree with them. Your thesis must commit to a specific claim, even if you later qualify it in the body.
Citing sources without commentary
Many students earn a Row B score of 1 or 2 because they quote or paraphrase three sources and then move on. The evidence and commentary row rewards explanation, not citation count. After every piece of evidence, write at least one sentence that interprets it in terms of your argument.
Summarizing sources instead of synthesizing them
A common structure is to devote one paragraph to each source: 'Source A says... Source B says... Source C says...' This is a summary, not a synthesis. Group your sources around your own reasons, not around the sources themselves.
Trying to earn sophistication with a single sentence
Adding 'To be sure, some may argue the opposite' at the end of your essay does not earn Row C. Sophistication is holistic. Graders look for complex thinking woven through the essay, not a token acknowledgment of complexity in the conclusion.
Forgetting to attribute sources
If you use evidence from a source without identifying it as Source A, Source B, or by the author's name, graders cannot count it toward your minimum of three. Attribution does not need to be formal, but it must be clear.