\documentclass[tikz,border=5pt]{standalone}
\usepackage{xcolor}
\usepackage{tikz}
\usepackage{pgfplots}
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\usetikzlibrary{arrows}
\begin{document}
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\draw (125,210) node [anchor=north west][inner sep=0.75pt] [align=left] {(a)};
\draw (320,210) node [anchor=north west][inner sep=0.75pt] [align=left] {(b)};
\draw (510,210) node [anchor=north west][inner sep=0.75pt] [align=left] {(c)};
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\end{document}