Option A - CORRECT.
Since there is a durability in convenience and quality compared to the old fashion vinyl record in the 1980s, Then an ''increase in size of record-buying public's can be assured''. This statement does complete the passage below.
Option B - INCORRECT.
The increase in profits of the record industry cannot be easily achieved immediately, it will still need some time for conviction of the record buying public's.
Option C - INCORRECT.
This option doesn't complete the passage below. Looking at the reason why there is a need for change and the effect of the change, it won't be easy to just eradicate the old version from the second hand market just like that.
Option D - INCORRECT.
The era of durable convenience does not totally eradicate the old version of record buying public's immediately. Some will still prefer the old version to the new one because choice making is not constant.
Option E - INCORRECT.
This option would have been suitable to complete the sentence because we are in a computerized world, but was unable to, because the record is still played in a compact disk the difference is just the size according to the speaker.