Concept:Critical thinking about media involves questioning censorship, bias, and sources.Explanation:Activity (a) makes students discuss if the government can block news. This leads to thinking about media freedom and censorship. Activity (b) asks students to compare news reports from different newspapers on the same issue. This helps them see bias and different perspectives. Activity (c) simply collects news from WhatsApp or social media. It does not involve comparison or questioning, so it does not develop critical thinking.Thus, only activities (a) and (b) are useful.Answer:Option B: (a) and (b)