[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The letter the represents decomposer in the given diagram is Letter A
[tex] \large \boxed{ \mathfrak{Explanation}}[/tex]
Because Letter A is demonstrating Mushroom (A type of fungi), and it has saprophytic mode of nutrition. hence it decomposes the dead organisms to get their food.
