Sentence Correction (SC) | Re: Of all the major developments in information technology that

First method. ; splitis vs was . The printing press was very influential certainly, when it came into being. Therefore, it entails a past tense. Now no one can say whether it is still as influencial. So all is verb choices are out. With A, B, C, D gone, only E is left.

Second method. Splitthan vs as , than is required because it is comparative degree. C, D, E remain . Drop C and D for using present tense. E survives