The copying mechanism of dna is most like
a. using a photographic negative to make a positive image
b. mixing flour, sugar, and water to make bread dough
c. joining together links to make a chain
d. carving a figure out of wood
e. threading beads onto a string

The correct answer is: a. using a photographic negative to make a positive image  

A negative image is a total inversion of positive image (normal image). Negatives are normally used to make positive prints.

This can be compared to copying mechanism of DNA-replication of DNA in which one strand of DNA (e.g. 3’-5’ orientation) is used as a template to make new strand with opposite orientation (5’-3’).