Two autosomal genes control horn color in dragons. pure-breeding gold-horned dragons were mated to pure-breeding silver-horned dragons. all of the f1 were gold. the f1 were intermated and the f2 generation consisted of 140 gold, 17 silver and 95 bronze. choose the genetically based phenotypic ratio that should be hypothesized to explain the f2 data.

select one:
9: 3: 3: 1
9: 3: 4
12: 3: 1
9: 7
15: 1
9: 6: 1
13: 3