please explain

Multiple Choice (5 points each) Use the chair structure of Compound D and the Lewis structures shown in the box to answer questions 8-10. 8. Which Lewis structure correctly represents the structure of Compound D? A) i B) ii C) iii D) iv 9. Calculate the difference in energy (absolute value) between the two chair conformations of Compound D. Useful energy values are provided in the chart at the top of the page. A) 8.4kJ/mol B) 9.5kJ/mol C) 19.8kJ/mol D) 14.1kJ/mol 10. Which non-hydrogen substituent(s) are in axial positions in the highest energy conformation of Compound D? A) CH3&CH(CH3)2 B) Cl C) Cl&CH3 D) CH3