Source:ARCO GMAT
<<A substance from the licorice plant,50 times sweeter than sucrose,was recently discovered>>,is not only a natural sweetener but also prevents tooth decay.
The solution is given as:
(C) A substance from the licorice plant,which was recently discovered to be 50 times sweeter than sucrose,
My doubt is about the use of which.Which needs an antecedent which according to me is the "licorice plant" and not the substance from the licorice plant.How do I know the correct antecedent for "which"?