Questions & Answers about C'est la moins chère des salades ici.
Why is it C'est and not Elle est?
French uses C'est to identify or evaluate something, especially before a noun or a superlative with a determiner. C'est la moins chère is the natural pattern.
Why do we need the definite article la before moins chère?
Superlatives require the definite article: le/la/les plus/moins + adjective. Here the set has a single cheapest item, so it’s la moins chère (the least expensive one). Without la, it would be a comparative idea, not a superlative.
Why is chère feminine and singular?
What does des mean in des salades here?