Option 2: (D), (C), (A), (B) -> Creates a logical flow: whales use sonar → this causes them to mistake plastic for squid → because of similar echoes → resulting in harm to marine mammals.
Hence, Option 2: (D), (C), (A), (B) -> The sentence reads: "Deep diving whales use sonar to find food, which may cause them to mistake plastic debris, like shopping bags, for squid due to similar 'echoes' from their shape, size and weathering, harming marine mammals with tissue damage, infection and starvation." This follows a clear cause-and-effect sequence explaining how sonar navigation leads to plastic ingestion and subsequent harm. -> correct