As in Annotate the table column highlighted by Tikzmark in Beamer, but with a new marker for the row.
In this case it's better not to draw borders.
\documentclass{beamer}
\usetheme{CambridgeUS}
\usecolortheme{beaver}
% The usual suspects
\usepackage{booktabs} % Tables
% The table highlighting for hypothesis discussion.
\usepackage[beamer,customcolors]{hf-tikz}
\usetikzlibrary{calc}
\hfsetbordercolor{none}
\begin{document}
\begin{frame}
\frametitle{Table highlighted by columns}
\[
\begin{array}{ccc}
\toprule
A & B & C \\
\midrule
1 &\tikzmarkin<2>{col}2 & 3 \\
\tikzmarkin<2>{row}4 & 5 & 6\tikzmarkend{row} \\
7 & 8\tikzmarkend{col} & 9 \\
\bottomrule
\end{array}%
\]
\end{frame}
\end{document}
