The social cost of carbon (SCC) is an estimate, in dollars, of the economic damages that would result from emitting one additional ton of greenhouse gases into the atmosphere. The SCC puts the effects of climate change into economic terms to help policymakers and other decisionmakers understand the economic impacts of decisions that would increase or decrease emissions. The country-level SCC for the India alone is estimated to be about $86 per tonne of CO2. At current emission levels, the Indian economy loses $210 billion annually. Hence option (a) is the correct answer.