Prior to the publication of charles darwin's book, on the origin of species, what was the prevailing public consensus regarding species evolution?

The prevailing public consensus regarding species evolution was that species were permanent and unchanging, prior to the publication of Charles Darwin's book, On the Origin of Species,

On the Origin of Species, is a work of scientific literature by Charles Darwin which is considered to be the foundation of evolutionary biology. 

the answer is b.) hydrogen bonds between bases.