please help me with the question below.Please show all steps

Question 9 (Adapted from the following source: Question 2, Mine Manager's Examination, Mine Management and Industrial Law, Nov 2005) You are the mine manager of Mine X and you want to expand your operations. The feasibility study shows that you have two options to consider. Option A is to sell your product to a local consumer. Option B is to export your product. The feasibility study yielded the following results for Options A and B. Option A Total reserve base 80 million tons Capital required R1 000 million Mining rate 8 million tons per year Yield 100% Production cost R35,00 ROM per ton Sales price R80,00 per ton 34 EMA3601/101/3/2020 Tax rate 30% NPV 47,09 million IRR 22% Question 9 (Adapted from the following source: Question 2, Mine Manager's Examination, Mine Management and Industrial Law, Nov 2005) You are the mine manager of Mine X and you want to expand your operations. The feasibility study shows that you have two options to consider. Option A is to sell your product to a local consumer. Option B is to export your product. The feasibility study yielded the following results for Options A and B. Option A Total reserve base 80 million tons Capital required R1 000 million Mining rate 8 million tons per year Yield 100% Production cost R35,00 ROM per ton Sales price R80,00 per ton 34 EMA3601/101/3/2020 Tax rate 30% NPV 47,09 million IRR 22% Question 9 (Adapted from the following source: Question 2. Mine Manager's Examination, Mine Management and Industrial Law, Nov 2005) You are the mine manager of Mine X and you want to expand your operations. The feasibility study shows that you have two options to consider. Option A is to sell your product to a local cu export your product. The feasibility study yielded the following results for Options A and B. Option A Total reserve base 80 million tons Capital required R1 000 million Mining rate 8 million tons per year Yield 100% Production cost R35,00 ROM per ton Sales price R80,00 per ton EMA3601/101/3/2020 Tax rate 30% NPV 47,09 million IRR 22% Option B Total reserve base 80 million tons Capital required R2 000 million Mining rate 8 million tons per year Yield 70% Production cost R35,00 per ROM ton Beneficiation cost R45,00 per ROM ton Transport cost R30,00 per sales ton Sales price US$ 40 per ton Exchange rate R7,00 per US$ Tax rate 30% NPV R192 million IRR 23% a) Which option will you choose? Give reasons for your answer. b) What is the payback period in years for both options