Given the flood of information presented by the mass media, the only way for someone to keep abreast of the news is to rely on __________ accounts.
The challenge is to keep abreast of news. And it is a challenge because of the "flood of information". So we are looking for abbreviated accounts of the information or accounts that distill all the information and present it in a capsule. Or in other words abridged accounts or synoptic accounts.
The other synonym pair sensational and lurid can be rejected as they don't ensure we can keep abreast of the flood of information that the news is.
Copious accounts would still contain a flood of information and understated accounts are those which are presented or expressed in a subtle and effective way. But this is about presentation and does not deal with the challenge of flood of information the way the synoptic and abridged accounts do. So we can reject these two as well.