pls explain why

Question 61 [0.5 mark] Which one of the following statements is correct? (a) Operations in high-level programming languages do not need to depend on the instruction set of any real CPU. (b) When an interpreter converts a program written in a high-level programming language to machine instructions, the interpreter performs optimisation over multiple statements of the program. (c) Compilers are used to convert programs to machine code and to execute the machine code on behalf of users. (d) Each C statement corresponds to exactly one LC-3 assembly instruction