I got this question right. However, I was kind of stuck between AC A and D. I get why D is right since the conclusion of this leads to thinking because there are some examples of "x" means they are apart of "y". But I am still having some troubles seeing why AC: A is wrong. Is it because we don't even know what the model offered by natural sciences are and its ability to be applied to the historians? A little help breaking this down would be great.

@XintongCao The first sentence says "the company president says that significant procedural changes were made before either she or Yeung was told about them." When it says "either she or Yeung", she is referring to the president.