Drawing a stacked venn diagram in latex

Question

I would like to draw a stacked venn diagram in latex that looks like the following figure.

Please any help. Thank you in advance.

Edited: I have tried to modify this latex, but got stock:

    \usetikzlibrary{arrows.meta} 
\usetikzlibrary{decorations.text}

\begin{tikzpicture}[scale=0.85] 
\foreach \X [count=\Y starting from 2] in 
{A,B,C} 
{\draw (-\Y,-\Y/2) circle ({1.5*\Y} and \Y);
\path[decoration={text along path,
text={classes |\itshape|\X},text align=center,raise=0.2em},decorate] (-\Y,-\Y/2) +(-1.5*\Y,0) arc(180:360:{1.5*\Y} and \Y);
} 
\draw ([xshift=-0.5cm,yshift=-0.5cm]current bounding box.south west) 
rectangle ([xshift=0.5cm,yshift=0.5cm]current bounding box.north east); 
\node[anchor=south] at (current bounding box.north) {\textbf{Three classes}}; 
\end{tikzpicture}

Answer 1

A very simple solution using a \foreach loop based on the code you provided could be:

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[scale=0.5]
\foreach \x [count=\y] in {A,B,C} {
    \draw (0,{-\y}) circle[radius=\y];
    \node at (0,{-2*\y+1}) {\x};
} 
\end{tikzpicture}

\end{document}

But note that you might want to draw the three circles beginning from the largest to the smallest if you want to fill them with some color for example, otherwise the largest circle would cover the others:

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[scale=0.5]
\foreach \x/\z [count=\y] in {C/yellow,B/orange,A/red} {
    \draw[fill=\z] (0,{\y-4}) circle[radius={4-\y}];
    \node at (0,{-2*(4-\y)+1}) {\x};
} 
\end{tikzpicture}

\end{document}