Answer D that was cut off was identical. Please help with these questions

Questions 1 - 4 refer to the structures shown at the below. (3.46) 1. The two substituents in C are to each other. A. cis B. trans 2. In D, the methyl group's position is A. axial B. equatorial 3. is the most stable conformation of cis-1-ethyl-3-methylcyclohexane. 4. A and D are A. constitutional isomers B. stereoisomers C. different conformations of the same compound