Hi @freakygeek,
This one slipped my attention - very sorry about that. :-/ Thanks @bagdbmba for the reminder.
Thanks @freakygeek for providing your detailed analysis as suggested. I really like how you've paid attention to the structure of your sentence, particularly for your analysis of option A: you are right that two DCs don't make an IC, and you can use that justification to eliminate option A. Having said that, I wouldn’t use sentence structure as the primary focus when eliminating options for this question. Each of the incorrect options has a meaning issue here. Let’s see how.
Option A: Incorrect, as you’ve pointed out.
Option B: Completely distorts the intended meaning. “That educators have not anticipated the impact of microcomputer technology” is the subject of the verb “can hardly be said”. Logically, this statement can’t be said to be at fault. It’s the educators who aren’t at fault.
Option C: “Educators who have not anticipated” restricts the meaning to those educators who haven’t anticipated the impact of microcomputers. However, the intended meaning is that educators in general can’t be faulted, not that a certain group of educators can’t be faulted.
Let’s see how the meaning gets restricted here. Look at these examples:
• The teacher distributed the notebooks among the students who had completed their homework.
=> Meaning: Only some students had done their homework. Only these students were given the notebooks.
• The teacher distributed the notebooks among the students, who had completed their homework.
=> Meaning: All the students referred to in the sentence had done their homework.
While these examples don't exactly correspond to the structure of this choice, I hope the meaning change is clear. "Educators, who have not..." means "all educators have not..." "Educators who have not..." means "some educators have not..."
Option D: Correct.
Option E: Again, this choice completely distorts the intended meaning. “The fact that educators are at fault” is misleading, since the point made by the sentence is that educators are NOT at fault. Moreover, ‘that fact’ is the subject of the verb ‘can hardly be said’. So, this choice says that “the fact… can hardly be said.” This meaning is illogical. If something is a fact, it’s already happened. So in other words, this choice is saying that the fact that educators are at fault has already happened, but it can hardly be said. There’s a serious meaning discrepancy here.
bagdbmba
C narrows down the educators' set to only those who have not anticipated the impact. So, it could be that there are other educators as well who are not involved here...But the intended meaning is not the same, the sentence actually refers to the (all)educators without narrowing down the set...and D makes it clear.
Now, please share
e-GMAT's awesome analysis and explanation

@bagdbmba: I agree with your analysis of the meaning of option C: this option distorts the intended meaning of the original sentence, which refers to educators in general and not to a specific group.
I hope this analysis helps!
Regards,
Meghna