The paragraph is talking about the 'Things that must have to take care in todays "BIG DATA" world where we have to deal with enormous amount of data.
In first line it is telling that we must have to reconsider our choices about "Exactitude" in this BIG DATA world. Now whether we have to neglect exactitude or put more weightage to it , is not clear at that level so read more.
In second line it is telling that in today's world when we're well connected thorough INTERNET, the way we handled data in past won't work now as now data is not that sparse. Now we're dealing with Big Data so we can't deal it with that conventional manner.
Now, here we come to the point. He said that in our past time when we were information deprived, we had to took care about exactitude. When data was sparse (means NOT BIG DATA) so we can suppose when we have limited information we must have to be very careful about every single piece of information. But in todays world when we're information affluent, we must not have to be that careful about Exactitude as even if we avoid some information it won't be a case that this act can cause bias in our analysis.
So, we can see that option C matched with all this conclusions.