(A) A substance from the licorice plant, 50 times sweeter than sucrose, was recently discovered
(B) A substance, which was recently discovered, from the licorice plant, 50 times sweeter than sucrose,
(C) A substance from the licorice plant, which was recently discovered to be 50 times sweeter than sucrose,
(D) A substance from the licorice plant, 50 times sweeter than sucrose, which was recently discovered,
(E) A recently discovered substance, 50 times sweeter than sucrose from the licorice plant,
Solution:
Modifier
A: "A substance ., ..,was discovered" ends and a new clause was recently starts, but without a subject. It is a run on sentence and hence, incorrect.
C: which refers to licorice plant. It should refer to substance.
D: which refers to sucrose and not substance, D is incorrect.
E: sucrose from the licorice plant suggests sucrose has been derived from licorice which is incorrect.
B: which was recently discovered, from the licorice plant, and 50 times sweeter than sucrosethey all modify A substance correctly and hence, B is the best choice.
Moreover, there is a mistake in the non-underlined part as well. not only a natural sweetener but also prevents tooth decay. natural sweetener is a noun whereas prevents is a verb.
Sentence Correction - 1000 Questions with Solution: