An educational institute is deciding to defend the use of more labour for maintaining their gardens for environmental reasons traditionally they have been using law movers which is running on fossil fuel which can be managed by one resource each resource cost the institutes and institute annually five lakh rupees the mow the loan using the loan mover or using hand used mechanical two like sickle assume the loan mover is rented and annual cost of fuel for the loan is $1,00,00$ and the rent cost is also $1,00,00$ the loan limits $10$ ton of CO$2$ emissions every year what should be the internal cost of carbon for the institute if they want to justify moving one more labour instead of loan mover consider the calculation only for one year no need of NPV calculation option one $70,000$ per CO$2$ option to $7000$ per CO$2$ option three $3000$ Parton CO$2$ option four $30,000$ Parton of CO$2$ option five none of this