C'est vs. elles sont

Question

Bonjour à tous !

Yesterday I was chatting with friends and then, I entertained a doubt that I couldn't clear up on my own. Here's the dialogue of two of my friends:

- J’ai aussi acheté des pêches.

- Oui, elles sont très bonnes et populaires

Accepted Answer

Hi PavelQR, 
Elles sont très bonnes is correct but i wouldn’t use the adjective ‘populaire’ to describe foodstuff. 
Instead, from the consumer -
Elles plaisent beaucoup
From the seller-
On en vend beaucoup
Hope this helps!

Answer

Here is my take on this:The original speaker spoke about peaches in general (des pêches -- some peaches). In the reply I would, therefore, use ce sont instead of elles sont. Had he made reference to some specific peaches (like he let me peek into his shopping basket), I would use elles sont.