I came across the following paragraph:
C ist eine imperative und prozedurale Programmiersprache, die der Informatiker Dennis Ritchie in den frühen 1970er Jahren an den Bell Laboratories entwickelte. Seitdem ist sie eine der am weitesten verbreiteten Programmiersprachen.
The sentence that I'm a little confused about is here:
Seitdem ist sie eine der am weitesten verbreiteten Programmiersprachen.
I understand it's saying "Since then, the C language is one of the most used Programming langauges." However, the main thing I'm unsure of is the indefinite article "eine".
"What" is "eine" referring to? My assumption is that "sie" is the relative pronoun, but "eine" just appears to be an actual word and not an indefinite article, although because it's declined I'm unsure of that. Is "ein-" also used as a replacement for "one" instead of "Einz"? Or is it "eine" accusative and "der" genitive for "Programmiersprachen"?
Lastly, my "superlativ" question should be easy, but when you use it as an adjective proceeding an article, do you use it like this:
"der ( weit | weiter | am weitesten )..."?
All examples online for the "superlativ" never seem to address using it after an article as an actual adjective and I just wanted to verify that I'm interpreting this correctly.