Which of these is the largest living carbon sink? A. insects B. ocean

C. forest

this is correct?
pls explain

Not quite. The largest living carbon sink is actually the ocean, not forests. The ocean has absorbed a significant amount of carbon dioxide from the atmosphere, helping to mitigate the impacts of climate change. However, forests are also important carbon sinks, as they absorb and store carbon through photosynthesis. So while forests are significant carbon sinks, the ocean is actually the largest living carbon sink.