What are the ways that an oil spill can negatively affect an aquatic ecosystem, including aquatic organisms?

Label a-f based on the table using c for concentrated and d for dilute

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

Ab c or d ? i’m not sure what the answer is