Match the following chromosomal abnormalities with their correct definitions:
\[
\begin{array}{|c|c|}
\hline
\text{Chromosomal Abnormality} & \text{Definition} \\
\hline
1. \text{Monosomy} & D. \text{Presence of only one copy of a particular chromosome} \\
\hline
2. \text{Nullisomy} & B. \text{Absence of both homologous chromosomes} \\
\hline
3. \text{Trisomy} & A. \text{Presence of three copies of a particular chromosome} \\
\hline
4. \text{Tetrasomy} & C. \text{Presence of four copies of a particular chromosome} \\
\hline
\end{array}
\]