Sentence Correction (SC) | Re: Since 1998, when the first direct discovery of so-called dark energy w

Since 1998, when the first direct discovery of so-called dark energy was made by Adam Riess, an American astronomer, and Brian Schmidt, an Australian astronomer, other toolsemerged by which astronomers can gauge dark energy by how it retards the growth of galaxies and other structures in the universe.


A. emerged by which astronomers can gauge dark energy by

B. emerged that astronomers can gauge dark energy through

C. emerged through which astronomers can gauge dark energy through

D. have