Ce sont vs Elles sont

Question

J'utilise ces tomates. ________ les dernièresI believe that "Elles sont" should be used here because we are talking about specific tomatoes. Yet "Ce sont" is correct here - why?

Accepted Answer

Bonjour Sam !
Madame Cécile has already acknowledged the same question on the following link ->
https://french.kwiziq.com/questions/view/in-the-sentence-j-utilise-ces-tomates-ce-cont-les-dernieres-why-can-t-we-say-elles-sont-les-derniere
Also, the explanation below is  given by her to a question in the same lesson you pinned ->
Even simpler than that, in French you cannot say -
Elle/il est +
une/un/ la/le /du/mon/ma /sa/son/leur  or a name 
Ils sont +
les/des/mes/leurs
so it has to be - C'est or Ce sont