A. It should be suggested that voters attend media literacy courses in order to acquire a minimal competency in interpreting public information.
It suggests a specific action (attending courses), but the statements do not imply that this is the solution. They only describe the problem.
B. Instruction in how to evaluate the veracity of an information source should be made a required part of the educational curriculum, both public and private.
It proposes making media literacy instruction mandatory in education, but while the statements note higher media illiteracy post-education, they do not support that it "should" be required, as this is prescriptive rather than inferable.
C. If all young people are to make informed voting decisions, many of them must learn how to differentiate between reliable and unreliable sources of information.
If young people are to make informed voting decisions—meaning decisions not unduly influenced by such biased sources—they must develop the ability to differentiate between reliable and unreliable information. Since many young people are media illiterate, learning this skill is a necessary condition for informed voting. CORRECT
D. If young people are not to be influenced by propagandists, they must increase their understanding of journalism.
It links avoiding propaganda to understanding journalism, but the statements focus on differentiating sources generally, not journalism specifically.
E. When researching political candidates, young people tend to confuse reasonably accurate reporting with unrealistic ideals.
It claims young people confuse accurate reporting with unrealistic ideals, but the statements provide no evidence for this specific confusion. They only address a general decline in differentiating sources.
IMO C