Which is the best explanation for why adenine matches with thymine, and guanine matches with cytosine? 1.)the bases only have a set number of available bonds 2.)there is a specific order that they go in 3.)they are antiparallel 4.)they have magnets in them

The answer here is #1

Each DNA bases match with a specific kind because of the chemical structure of each base. To this end, they must be complementary to fit.

Adenine and Thymine produce two bonds between them, while Guanine and Cytosine achieve three hydrogen bonds.

A. Carbon

Explanation: