Option A: INVALID
The statement is unambiguous and explanatory but it does not conform to the summary aim of the writer nor does it, the listener and reader. It has insufficient information as to the subject matter.

Option B: INVALID
The use of the connector ''and'' makes it ambiguous and verbose but for that it'd have been nice response. it is a kind of statement that connects the two active words ''frequently scientific'' and ''sometimes concentrations as a predicate to the adverbial ''always''.

Option C: VALID
Here, the use of comma (,) means it is a continuous sentence, using the conjunction ''and'' would mean a slight disagreement would occur between the principal words.
Hence, Option C seems the most appropriate.

Option D: INVALID
This is a grammatically incorrect statement. To a layman it could be correct but linguistically it is not.''uses'' and ''adoption'' could mean the same thing in the context they have been used, touch over-specification.

Option E: INVALID
Vague, archaic, obsolete and outdated language format. It is pardonable in option D but inexcusable in further occurrence.