Source of commercial chewing gum latex is

The correct option is D Achras sapota
The latex of some plants is commercially important such as
(i) Source of commercial rubber is the latex of $Hevea$ $brasiliensis$, $Ficus$ $elastica$, $Cryptostegia$, $Manihot$ .
(ii) Source of enzyme papain is the latex of $Carica$ $papaya$.
(iii) Source of chewing or chewing gum is the latex of $Achras$ $sapota$.

So, the correct answer is option D.