In what part of the cell cycle does the dna make a copy of itself?

a. interphase
b. prophase
c. telophase
d. cytokinesis

A. Interphase. 

The cell makes a copy of DNA during the S-phase which is in the interphase. An easy way to remember this is by realizing that the S stands for synthesis and DNA Synthesis is what it is called.

Ithink you should go back and learn in school rather then here asking questions