Based on the data shown in the graph, which of the following is the most plausible hypothesis for the cause of the trend in CO2CO2 levels from about 5,000 years ago to the present?AVolcanic activity, which can release over 6 million tons of carbon dioxide per year, has contributed to an increase in ash and dust in the atmosphere, which trap CO2CO2. This has caused an increase in CO2CO2 in the atmosphere over the past 5,000 years.BHuman activity, especially the burning of fossil fuels, has led to an increase in anthropogenic carbon dioxide emissions. This has caused a doubling in the concentration of CO2CO2 in the atmosphere.CErosion of limestone from sedimentary rock, a result of physical and biological weathering, has released a large amount of carbonic acid into the atmosphere. This has caused a decrease in the concentration of CO2CO2 in the atmosphere.DIncreasing rates of photosynthesis in the summers, which are a direct result of increased global temperatures, have led to an increased release of CO2CO2 in warmer months. This has caused the seasonal cycle of CO2CO2 concentrations in the atmosphere.

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